Geirfa

 

Cydnabyddiaeth

Mae’r Comisiwn Brenhinol yn ddiolchgar i’r Arolwg Ordnans ac i Brifysgol Bangor am caniatâd i atgynhyrchu’r eirfa hon, y gellir gweld fersiwn llawnach ohoni ar wefan yr Arolwg Ordnans. Rhaid rhoi cydnabyddiaeth arbennig i’r Athro Hywel Wyn Owen, Dr Geraint Wyn Jones a Gruffudd Prys o Brifysgol Bangor a fu’n gweithio gyda’r Arolwg Ordnans i ddatblygu ei 'Geirfa elfennau mewn enwau lleoedd'.

 

adj	=	ansoddair		nf	=	enw benywaidd
adv	=	adferf		nm	=	enw gwrywaidd
f	=	benywaidd		np	=	enw lluosog
m	=	gwrywaidd		pr	=	arddodiad
pl	=	lluosog		num	=	rhif

 

 

Elfen	Cyfiethiad Saesneg	Enghraifft
abad nm	abbot	Tirabad SO8741 Hafod-yr-Abad SJ1848
aber nm/f	estuary , confluence , stream	Aberystwyth SN5881 Llanaber SH6017
acer nf aceri , acrau pl	acre	Ddwy-acer SJ0364 Ty'n-yr-acrau SH5833
aderyn nm adar pl	bird	Brynyradar ST1675 Craig yr Aderyn SH6406
adwy nf	gap , pass	Craig-adwy-wynt SJ1253 Nant Adwy'r-llan SH8546
ael nf	brow , edge	Ael-y-coryn SJ1633 Aelybryn SN5872
aelwyd nf	hearth	Aelwyd-uchaf SJ0974 Aelwyd Brys SH9250
afallen nf	apple-tree	Afallenchwerw SN9854 Dolafallen SN9566
afon nf	river	Afon-wen SJ1371 Glanrafon SN6790
allt , gallt nf elltydd , alltau pl	hillside , cliff , wood	Allt-mawr SO0746 Alltwalis SN4431
am pr	near , beside , around	Amlwch SH4493 Henllan Amgoed SN1820
amlwg adj	evident , visible , prominent	Brynamlwg SN2214 Grwnamlwg SJ1515
angell nf	offshoot , tributary , leg , wing , limb	Aberangell SH8410 Afon Angell SH8111
anner , annair nf	heifer	Cwm Penanner SH9146 Dolpenanner SH9168
ar pr	on , upon , over	Hendy-gwyn ar Daf SN2016 Pen-y-bont ar Ogwr SN1745
ardd, ard nm	hill , height	Talardd SN4941 Pennard SS5688
argae nm argaeau pl	dam, mill-dam , embankment	Rhydargaeau SN4326 Penyrargae SH3284
arglwydd nm -es n f	lord , lady	Waunarlwydd SS6095 Caer-arglwyddes SN6991
argoed nf	wood , grove	Argoed ST1799 Twyn-yr-argoed SO4207
arian nm	silver	Carn yr arian SN9412 Fedw-arian SH9136
arth nm/f	bear	Aber-arth SN4763 Afon Arth SN4862
asgwrn nm esgyrn pl	bone	Mynydd yr Esgyrn SJ0818 Esgyrn SM9634
athro nm	teacher , father confessor	Caeathro SH5061 Pant Yr Athro SN3613
aur nm	gold	Bron-yr-aur SH7302 Llannerch-yr-aur SN8697
awel nf awelon pl	breeze	Morawel SN0843 Awelfryn SN4223
b-	A word starting b may be a mutated form of a word starting p
bach adj	small , little	Dre-fach SN5045 Cwm-bach Llechryd SO0254
bach nf bachau pl	nook , corner , bend in a river	Bachau SH4383 Eglwys-bach SH8070
bachell nf bachell , bachellau pl	corner , nook , angle	Fachell SH9978 Fachell SH5466
bala nm	narrow land between two lakes , outlet of a lake	Bala SH9236 Brynbala SN5986
ban nf bannau pl	peak , beacon	Pen y Bannau SN7466 Rhydybannau SN5251
banc nm	bank , hill , slope	Bancyfelin SN3218 Pen-y-banc SN4037
bangor nf	(ecclesiastical) settlement enclosed within a wattled fence	Bangor SH5771 Bangor Teifi SN3840
banhadlen nf banadl, banal pl	broom	Cefn-banadl SN6462 Bronbanadl SN6469
banhadlog nf	broom patch	Maesbanadlog SN7067 Banhadlog SN9780
bannog adj	high , horned , turreted	Bron-Bannog SJ0352 Cefnbannog SJ0251
banw nm	young pig	Blaen Cwm Banw SO0722 Nant-y-banw ST4097
bar nm	top , summit	Crug-y-bar SN6537 Bryn-y-bar SH2875
barcud nm	kite , buzzard	Carreg y Barcud SM7724 Llwyn-y-barcud SN4109
bardd nm beirdd pl	bard	Llofft-y-bardd SN8953 Cwrtbrynbeirdd SN6618
bargod nm	boundary (eaves)	Bargoed ST1499 Bargod Taf ST1098
batin , bating (see betin etc.)
baw nm	dirt	Pig y Baw SN0140 Bryn y Baw SJ1678
bedd nm beddau pl	grave	Beddgelert SH5948 Beddau ST0685
bedwen nf bedw pl	birch	Craigyfedwen SH7576 Berthyfedwen SN3441
bedwlwyn nm	birch grove	Bedwlwyn SJ2236 Bedwlwyncoch SN8823
beidr nf	lane , path	Penfeidr SN1750 Penyfeidr SM8726
beili nm beiliau pl	bailey	Beili SN3827 Beili-glas SO3010
bela , bele nm	marten , wild beast	Trebela ST4298 Clunbele SN3433
bendigaid adj	blessed	Llanfendigaid SH5605 Pontrhydfendigaid SN7366
berw nm	rush of water	Berw-ddu SN9602 Berw-uchaf SH4671
betin , beting , bietin , bieting nm	pared and burnt land	Cefn-betingau SN6601 Batingau SJ0658
betws nm	chapel	Betws Bledrws SN5952 Betws-y-coed SH7956
beudy nm	cow-house	Beudiau SN5549 Beudy-mawr SH3133
bid nm	quickset hedge	Carreg Fidwen SH6481 Twyn y Fidffawydd SO1102
blaen nm blaenau pl	source of river or stream; highland	Blaenau Ffestiniog SH7045 Blaengarw SS9092
blaidd nm	wolf	Cae'r-blaidd SN5133 Castell-y-blaidd SO1279
bod nm/f	abode , dwelling	Bodedern SH3380 Meifod SJ1512
bol , bola nm	belly , swelling	Rhos-y-bol SH4288 Cors-y-bol SH3784
bon nm	stock , stump , base	Bon-y-maen SS6895 Bon-yr-on SJ0646
boncen , boncyn (see poncyn , poncen )
braenar , branar nm brynar n f	fallow land	Mynydd Branar SH8771 Braenarauduon SN7246
braich nm/f	ridge , arm	Pen-y-braich SJ0316 Braich Anelog SH1427
brân nf brain pl	crow	Cwm-brân ST2995 Llanfihangel Nant Brân SN9434
bras adj breision pl	big , fat , rich	Bryn-bras SH8543 Maen Bras SH9239
bre nf	hill	Pen-bre SN4201 Moelfre SH5186
brenin nm	king	Rhodiad-y-brenin SM7627 Plas y Brenin SH7157
brest nf	hill-breast	Brest Cwm-Llwyd SN7019 Brestbaily SN9838
brith adj braith f	speckled; coarse	Brithdir SH7719 Pontllan-fraith ST1896
briw nm (adj)	broken , shattered	Briwnant SH8402 Carn Briw SN0537
bro nf	region; vale , lowland	Llanbedr-y-fro ST0876 Rhyd-y-fro SN7105
bron nf bronnydd pl	hill-breast (breast)	Bronydd SO2245 Brongest SN3245
brwynen nf brwyn pl	rush	Brwynen SJ0321 Cwmbrwyn SN2512
brwynog nf	place of rushes , marsh	Brwynog SH7564 Brwynog SH3586
brych adj brech f	speckled	Brechfa SN5230 Llanfrechfa ST3193
bryn nm bryniau pl	hill	Bryn-berian SN1035 Llanbryn-mair SH8902
bryncyn nm	hillock	Bryncyn-felen SJ2019 Bryncyn-hydfa SH3847
buarth nm buarthau pl	farm-yard; pen	Buarth Berran SH5764 Buarth y Caerau SO0713
buches nf	milking-fold (herd)	Buches y Foelortho SJ0421 Fuches SN8489
budr adj	dirty , mucky	Nant Budr SH7435 Rhyd-fudr SN6567
bugail nm bugelydd , bugeiliaid pl	shepherd	Bugeildy SO1979 Tafarn-y-Bugail SN2546
bustach nm bustych pl	bullock	Nant y Bustach SN8153 Cwm Bustach SH8502
buwch nf buchod; (gwartheg) pl	cow; cattle	Cas-fuwch SN0229 Cwm y Fuwch SS9490
bwbach nm	bogey , goblin	Allt y Bwbach SN4528 Bryn Bwbach SH6236
bwch nm	buck	Castell-y-bwch ST2792 Craig-y-bwch SH6414
bwla nm	bull	Nantybwla SN3821 Alltybwla SN2642
bwlch nm bylchau pl	gap , pass	Bwlch-y-groes SN2436 Tan-y-bwlch SH6540
bwrdd nm	table	Bwrdd Arthur SH9667 Bwrdd y Rhyfel SJ1475
bychan adj bechan f bychain pl	small, little	Morfa Bychan SH5437 Llanfairfechan SH6874
byr adj ber f	short	Byrgoed SH9837 Byrgwm SO2303
caban nm	cottage, cabin	Caban-coch SN9163 Caban SH3938
cadair nf	seat, stronghold	Cadair SJ0060 Penacader SN4436
cadarn adj	strong , powerful	Crucadarn SO0942 Twyn Cerrig-cadarn SN9438
cadno nm	fox	Carreg Cadno SN8715 Clo Cadno SO1116
cadw nm	preserve , spinney	Maes-cadw SJ0147 Coed Cadw SH5978
cae nm caeau pl	field , enclosure	Pen-y-cae SJ2845 Rhes-y-cae SJ1870
caer nf caerau pl	stronghold , fort	Caernarfon SH4862 Caerdydd ST1876
caeth adj & nm/f caith pl	captive	Cricieth SH5038 Caethle SN6099
cafn nm	ferry-boat	Tal-y-cafn SH7871 Nant-y-cafn SN8107
cain adj	fine , fair , beautiful; ridge	Cilcain SJ1765 Pistyll Cain SH7327
calch nm	lime , chalk	Pen Cerrig-calch SO2122 Twyn Calch ST2699
caled adj & nm	hard	Sarn-y-bryn-caled SJ2105 Cae Caled SH4069
cam adj	crooked , bent	Pengam ST1597 Camros SM9220
camfa nf	stile	Nant Maes y gamfa SH8112 Camfa Derw SH6744
canol nm	middle	Y Felin Ganol SM8025 Tircanol SS6798
cantref nm	hundred (territorial division)	Cantref SO0525 Cantref ST2815
capel nm	chapel	Capel Curig SH7258 Capel Bangor SN6580
carn nf carnau pl	heap of stones , tumulus	Pen-y-garn SN5731 Aber-carn SN5731
carnedd nf/m carneddau , carneddi pl	heap of stones , tumulus	Penygarnedd SJ1023 Bryncarnedd SN6082
carreg nf cerrig pl	stone , rock	Llanbadarn y Garreg SO1148 Cerrigceinwen SH4273
carrog nf	torrent , fast-flowing stream	Carrog SH7647 Dolgarrog SH7767
carrog nf	brook	Carrog SJ1143 Carrog SH7647
carw nm	stag	Gallt-y-carw SH7521 Cilcarw SN4912
cas nm	castle	Cas-bach ST2583 Croes Cas-lai SM9125
caseg nf cesig pl	mare	Afon Caseg SH6566 Llyn Caseg-fraith SH6758
castell nm cestyll pl	castle; small stronghold; fortified residence	Castell Nedd SS7597 Castell-Paen SO1646
cath nf	cat	Carreg-y-gath SH5765 Rhyd-y-gath SN2131
cau adj	hollow; enclosed	Caubwll SJ0171 Cwm Cou SN6264
cawl nm	sea-kale (soup)	Porthcawl SS8277 Heol-y-cawl ST0887
cawr nm -es f ceiri , cewri pl	giant	Castell Cawr SH9376 Barclodiad y Gawres SH3270
caws nm	cheese	Nant-y-caws SN4518 Cerrig Caws SH9556
ceffyl nm ceffylau pI	horse	Bryn Ceffyl SH7837 Allt y Ceffylau SH6747
cefn nm cefnydd pI	r idge	Cefn-brith SH9350 Cefn-coch SJ1351
cefnen nf	ridge	Cefnen SH8776 Cefnen Wen SH8854
cegid np	hemlock	Cegidfa SJ2211 Bryniau Ystumcegid SH5041
cegin nf	kitchen	Abercegin SH5972 Gegin SJ2752
cegyr np	hemlock	Cwm-cegyr SO2517 Dolycegyr SN9054
cei nm	quay	Ceinewydd SN3859 Cei Ystagbwll SR9995
ceiliog nm	cock	Caergeiliog SH3078 Croesyceiliog SN4016
ceirch , cyrch nm	oats	Bryn-ceirch SN4739 Cae-ceirch SH7719
ceisiad nm ceisiaid pl	bailiff	Nant-y-ceisiad ST2089 Llain Ceisiad SN1728
cell nf celloedd , cellau pl	cell	Gell-fain SN8432 Dolgellau SH7217
celli nf	grove	Y Gelli Gandryll SO2242 Pencelli SO0925
celynnen nf celyn pl	holly tree	Llwyncelyn SN4459 Trecelyn ST2197
celynnog , clynnog nf	holly grove	Clynnog SH4149 Ffridd Celynnog SH8019
cemais , (cemaes) nm (from np)	bend in river or coastline	Cemaes SH3693 Cemais Comawndwr SO3404
cennin np	leeks	Llanbedrycennin SH7569 Cilcennin SN5260
cerddinen , cerdinen nf cerddin , cerdin pl	mountain-ash	Blaencerdinfach SN3748 Bryn-Cerdin SN3848
cerwyn nf	vat , pot-hole	Foel Cwmcerwyn SN0931 Cwmcerwyn SS8390
cesail nf	hollow	Cesailgwm SH6921 Coed y Gesail SH8210
cest nf	belly , swelling	Porth-y-gest SH5637 Brongest SN3245
ceulan nf	river bank	Cwm Ceulan SN7090 Fforch Ceulan SN7520
ceunant nm	ravine , gorge	Pen-y-ceunant SJ0823 Mynydd Ty'n-y-ceunant SH7308
ch-	A word starting ch may be a mutated form of a word starting c
chwaen nf	piece of land , breezy , windy place	Chwaen Bach SH3983 Chwaen-wen SH3682
chwilog nf	land infested with beetles	Chwilog SH4338 Chwilog Fawr SH4438
ci nm cŵn pI	dog	Tre-cŵn SM9632 Carnedd y Ci SJ0534
cigfran nf cigfrain pl	raven	Craig Nyth-y-gigfran SH6845 Cwmgigfran SN4519
cil nm ciliau pl	retreat , recess , corner	Llanycil SH9134 Ciliau Aeron SN5058
cilfach nf	nook	Gilfachreda SN4058 Y Gilfach-goch SS9889
cist nf	chest	Cist Cerrig SH5438 Gist Wen SO0621
cistfaen nm	stone-chest	Cistfaen SN8677 Cistfaen SH9938
clafdy nm	hospital	Clafdy SH3569 Rhyd-y-clafdy SH3234
clawdd nm cloddiau pl	ditch , hedge	Penclawdd SS5495 Clawddnewydd SJ0852
clegyr nm	rock , cliff	Clegyr-mawr SJ0549 Penclegyr SM7629
clip nm -iau pl	precipice , crag , steep slope	Clip SH6532 Clipiau SH4146
cloch nf	bell	Maenclochog SN0827 Clochfaen SN9078
clochydd nm	sexton , parish clerk	Dôl-y-clochydd SH7321 Bryn-y-clochydd SH8760
clog nf clogau pl	crag , precipice	Clogfryn SN4462 Carn Pen-y-clogau SN7118
clogwyn nm	precipice , steep rock hanging on one side	Clogwyn SH7217 Clogwynygarreg SH5553
clos nm	yard before a house	Clos SN1840 Closglas SN6424
clun nm	meadow , moor	Clunderwen SN1219 Cluncoch SN3732
clwt , clwtyn nm clytiau pl	patch	Clwt-y-bont SH5762 Clwt SJ3245
clwyd nf clwydydd pl	hurdle , gate	Clwydygraig SO1624 Pentreclwydau SN8405
clyd adj	sheltered	Cwm-clyd SN6273 Lletty-clyd SN2737
cnap , cnepyn nm	top , summit of hill , short sharp ascent	Pen-y-cnap SN5121 Bryn-cnap SH9465
cnol nf	hillock , knoll	Twyn-y-gnol ST2296 Cnol Wen SN8260
cnwc nm	hillock	Cefn Cnwc SN7759 Pencnwc SN2222
cnwch nm	hillock	Cnwch-coch SN6775 Cefn Cnwcheithinog SN7549
coc , cocyn nm cociau pl	tump , hillock	Bryn-cocyn SH9968 Ffridd Cocyn SH6204
coch adj cochion pl	red	Penrhyn-coch SN6484 Bryn-coch SS7499
coeden nf coed pl	tree	Coed-elái ST0185 Coed-duon ST1797
coedlan nf	copse , coppice , woodland glade , grove	Coedlannau SN4648 Llannerch Coedlan SO0940
coetan nf	quoit	Carreg Coetan SN0639 Coetan Arthur SH3981
coetgae nm	woodfield , field recovered from forest; palisaded enclosure	Coetgae Du SO0316 Panwaun Pen-y-coetgae SN9000
collen nf cyll , coll pl	hazel	Cwrt y Gollen SO2317 Cyll SN9788
colomen nf colomennod pl	dove	Colomendy SJ3045 Moel Golomen SN7087
colwyn nm	whelp	Bae Colwyn SH8678 Tregolwyn SS9475
comin nm comins pl	common	Comins-coch SN6182 Comin-y-garth SN9854
congl nf	corner	Congl-y-cae SH2133 Gongl-gam SH3471
copa nf	crest , summit	Copa Ceiliog SH8748 Copa Shôn SN7899
cored nf	weir	Pant-y-cored SO0432 Gored Goch SH5471
corlan nf	sheep-fold	Corlan Fraith SH6300 Corlannau SS7690
corn nf	stall , crib	Llanfihangel Rhos-y-corn SN5534 Corn y Fan SN9835
cornant nf	brook	Pantycornant SS9688 Cornant SN4952
cornel nf	corner	Plas-yn-cornel SH9366 Pwllcornel SN3742
coron nf	crown	Goron SO1094 Goron-ddu SO1896
cors nf corsydd pl	bog	Llan-gors SO1327 Y Gors-las SN5713
craf nm	garlic	Aber-craf SN8112 Crafnant SH6129
craig nf creigiau pl	rock	Craig-y-nos SN8415 Graig SH8074
crau nm	piggery , sty; stronghold	Llanfihangel-y-creuddyn SN6676 Pont Creuddyn SN5552
criafolen nf criafol pl	mountain-ash	Waun y Griafolen SH8129 Pant-y-griafolen SH9149
crib nf cribau pl	crest , summit	Cribyn SN5251 Cefn Crib SO2300
crin adj	withered	Cefn-crin SO0272 Cringoed SH8801
crochan nm	cauldron	Foel Crochan SH7610 Maes-y-crochan ST2383
croes nf	cross	Pen-y-groes SN5813 Tŷ-croes SH3472
croesffordd , croesheol , croeslon nf	cross-roads	Groesffordd SO0728 Ty'n-y-groesffordd SJ1359
crofft nf crofftau pl	croft	Grofft SH8104 Bryn-y-crofftau SN7463
crug nm crugiau pl	heap , tump	Crug-y-bar SN6537 Yr Wyddgrug SJ2363
crwm adj	crooked , bent	Crymlyn ST2198 Crymych SN1833
crwth nm	tump , hillock	Cwmcrwth SN5724 Llwyn y Crwth SJ2000
cul adj	narrow	Cefn Cul SN8618 Esgair Gul SN8856
cut nm cutiau pl	shed , sty	Cutiau SH6317 Ffynnon Cut-y-geifr SH9833
cwar nm cwarrau pI	quarry	Pen y Cwar SN6308 Cwarrau-mawr ST1489
cwm nm cymau , cymoedd pl	valley , dale	Cwmcewydd SH8713 Cwmaman ST0099
cwmwd nm	commote (territorial division)	Mynydd Tir-y-cwmwd SH3230 Cefn Cwmwd SH4374
cŵn (see ci)
cwrn nm cyrn , cyrnau pI	stack , peak , point	Pencyrn ST0077 Trecyrn SN2426
cwrt nm	court , yard	Cwrtnewydd SN4847 Cwrt Henry SN5522
cwrw nm	ale	Pwll-y-cwrw SO0935 Bryn Cwrw SN0007
cyff , cyffyll nm	stock , stump	Y Gyffylliog SJ0557 Pont Rhyd-y-cyff SS8789
cyffin nm	boundary , frontier	Gyffin SH7776 Penisacyffin SJ0513
cyfrwy nm	ridge between two summits (saddle)	Pen y Cyfrwy SM7524 Carn Gyfrwy SN1432
cyfylchi nf	circular fortress	Gyfylchi SS8195 Dwygyfylchi SH7377
cyfyng adj	narrow strait	Cyfyng SH7753 Pont Gyfyng SH5245
cyll (see collen)
cymer nm cymerau pl	confluence	Rhydcymerau SN5738 Pentrellyncymer SH9752
cythraul nm	devil	Craig y Cythraul SJ2347 Cadair y Cythraul SH3964
cytir nm	common	Cytir SH8715 Cytir-bach SN2449
d-	A word starting d may be a mutated form of a word starting t
dafad nf defaid pl	sheep	Carreg y Ddafad SN2751 Pantyddafad SN6768
dafadfa nf	sheep-fold	Dafadfa-isaf SN6821 Dafadfa Uchaf SN6921
daIfa nf	pound	Ddalfa SN8931 Cors y Ddalfa SH4147
dan (see tan )
dâr nf deri pl	oak	Aberdâr SO0002 Bwlch-y-ddâr SJ1622
das (see tas )
dau num dwy f	two	Aberdauddwr SN6954 Bryn-ddwy-nant SO2035
dd-	A word starting dd may be a mutated form of a word starting d
deilen nf dail pl	leaf	Tir-y-dail SN6212 Castell y Dail SO0989
delw nf	image	Carnedd y Ddelw SH7070 Craig y Ddelw SS9298
deon nm	dean	Caerdeon SH6518 Cae'r Deon SH3385
derlwyn nm	oak-grove	Carregyderlwyn SN8070 Cefn Derlwyn SO9347
derwen nf derw pl	oak	Derwen-las SN7299 Derwen-gam SN4558
dibyn nm	steep slope , precipice	Dibyn Du SN7965 Cwm Pont-bren Dibyn SH8800
diffwys nm	precipice , abyss	Diffwys SJ0257 Llechwedd Diffwys SH8915
din nm	hill-fortress	Dinbych SJ0566 Caerfyrddin SN4120
dinas nm/f	hill-fortress; city	Dinas Dinlle SH4356 Pendinas SJ2251
diserth nm	hermitage	Diserth SJ0579 Dyserth SJ0579
disgwylfa nf	place of observation , look-out point	Twyn Disgwylfa SN9531 Disgwylfa SN5009
dôl nf dolau , dolydd pl	meadow	Dolbenmaen SH5043 Dôl-y-bont SN6288
dorglwyd (see torglwyd )
draenen nf drain pl	thorn	Draenen Pen-y-graig ST1783 Ffynnon-ddrain SN4021
draenllwyn nm	thorn-bush	Draenllwyn-du SN7051 Esgair Draenllwyn SN9294
draw adj	yonder	Heol-draw SO1820 Pen-draw SH5561
dreiniog adj	thorny	Bryndreiniog SJ0825 Domen Ddreiniog SH5903
drud nm drudion pl	hero , fighter	Cerrigydrudion SH9548 Cerrig Drudion SN6250
drum (see trum )
drws nm	gap , narrow pass (door)	Drws Gwyn SH7959 Drws-y-coed SH5453
dryll nm	small piece of land	Y Gelligandryll SO2242 Dryll SJ2646
dryslwyn nm	bramble bush	Dryslwyn SN5520 Dryslwyn SN6242
du adj duon pl	black , dark	Dulais SS6190 Ynys-ddu ST1892
dwfn , dyfn adj dofn f	deep	Dyfnant SO0260 Wernddofn SN2136
dwfr , dŵr nm	water	Erw-ddwfr SH7232 Llwyn-dwfr SN1023
dyffryn nm	valley	Dyffryn SS8593 Llanbedr Dyffryn Ceiriog SJ1459
dylif nm	flood , deluge , torrent	Dylife SN8694 Afon Dylif SH6144
dylluan (see tylluan )
-dyn	fortified enclosure	Taltreuddyn SH5825 Nant Creuddyn SN5550
dyrys adj	wild , rough	Cefndyrys SO0473 Fronddyrys SO1559
ebol nm ebolion pl	colt	Crug-ebolion SN2631 Llwynyrebol SN1326
efail (see gefail )
efwr nm	cow-parsnip; yew	Cyll Efwr SN3919 Dinefwr SN6122
eglwys nf	church	Yr Eglwys Newydd ST1580 Cwm-yr-eglwys SN0140
eiddew nm	ivy	Moel Eiddew SH8605 Llyn Eiddew-bach SH6434
eira nm	snow	Nant-yr-eira SH6808 Maeneira SH7267
eisingrug nm	heap of bran or corn husks	Eisingrug (Singrug) SH6134 Afon Eisingrug SH6234
eisteddfa nf	seat , resting , place	Eisteddfa SN 799841 Cripiau Eisteddfa-fach SN8084
eisteddfod nf	meeting-place , assembly	Bryn Eisteddfod SH8076 Eisteddfod SJ2452
eithin np	furze	Talcen Eithin SH8343 Tir-eithin SS9781
eithinog nf	furze patch , gorse land	Twyn Eithinog SN8009 Bryn Eithinog SN7866
elor nf	bier	Bwlch-y-ddwy-elor SH5550 Elorgarreg SH9653
eos nf	nightingale	Bryn-yr-Eos SJ2840 Cileos SJ0825
ergyd nm/f	cast; projecting spur of land	Ergyd Isaf SS7988 Ergyd Uchaf SS8088
erw nf erwau pl	acre	Croes-erw SS8795 Erw Barfau SN7578
eryr nm	eagle	Gartheryr SJ1623 Foel Eryr SN0631
esgair nf	long ridge	Esgairgeiliog SO7506 Pant-yr-esgair SN6431
esgob nm	bishop	Plas-yr-Esgob SJ1061 Pigyn Esgob SH7651
esgyrn (see asgwrn)
ewig nf	hire	Rhyd Yr Ewig SH9343 Gwern-yr-ewig SH9631
f-	A word starting f may be a mutated form of a word starting b or m
-fa (see ma)
ffald nf ffaldau pl	sheep-fold , pound , pen , run	Bancyn-ffald SM6922 Carn-ffald SM7528
ffarm (see fferm )
ffawydden nf ffawydd pl	beech tree	Ffawydden SO2525 Twyn y Fidffawydd SO1102
ffawyddog nf	beech grove	Ffawyddog SS9189 Ffawyddog SO2018
fferm nf	farm	Fferm-y-Capel SN1529 Fferm Felinfach SN5646
ffin nf	boundary	Ffos-y-ffin SN4460 Ffinnant SN9791
fforch nf	bifurcation of streams , fork , shape of fields , etc	Fforch Ceulan SN7520 Cilfforch SN4461
ffordd nf	way , road	Banc-y-ffordd SN4037 Pen-y-ffordd SJ3061
fforest nf	forest , park	Fforest-fach ST6296 Trefforest ST0888
ffridd , ffrith nf ffriddoedd pl	wood; mountain enclosure , sheep walk	Bwlch-y-ffridd SO0695 Ty'n-y-ffridd SJ1130
ffrwd nf	stream , torrent	Gwenffrwd SO5306 Ffrwd-grech SO0227
ffwrnais , ffwrnes nf	furnace	Ffwrnais SN6895 Craig Ffwrnais ST2495
ffynnon nf ffynhonnau pl	spring , well	Gwarffynnon SN5750 Llwynffynnon SN4038
fry pr	above	Neuadd-fry SO1622 Ty-fry ST4397
g-	A word starting g may be a mutated form of a word starting c
gafl nf geifl pl	fork	Bwlch yr Eifl SH3645 Yr Eifl SH3644
gafr nf geifr pl	goat	Corngafr SN2722 Cae'r-geifr SH1628
gallt (see allt )
gardd nf gerddi, garddau pl	garden; enclosure	Yr Ardd-lîn SJ2615 Ardderfin SN3215
garth nm	promontory, hill, enclosure	Llanfihangel-ar-arth SN4539 Penarth ST1871
garw adj	coarse, rough	Blaengarw SS9092 Bryn Garw SN8077
gast nf	bitch	Cefngast SN9147 Cwm Gast SH8509
gefail, efail nf	smithy	Cefn-y-gefail SN7838 Efail-newydd SH3535
geirw np	rush of waters, waterfall	Pont Aber-Geirw SH7629 Geirw SN7727
genau nm	pass, opening of a valley	Llanfihangel Genau'r-glyn SN6286 Coedgenau SN9933
glais, nm/f	brook	Y Glais SN7000 Dulais SS6190
glan nf	river-bank, hillock	Glan-Clwyd SJ0573 Glan Adda SH5770
glas adj gleision pl	green, when referring to grass, pasture or leaves; or blue, when relating to the sea or air	Glasallt-fawr SN7330 Bryn Glas SJ0877
glo nm	charcoal, coal	Nant-y-glo SO1910 Cwm-y-glo SH5562
glyn nm	deep valley, glen	Glyn-hir SN6415 Llanfihangel Glyn Myfyr SH9949
godre nm	edge or foot of hill	Godre'r-graig SN7507 Godreaman SO0100
gof nm	smith	Rhyd-y-gof-isaf SN5552 Bron-y-gof SJ0856
gofer nm	rill, overflow of a well	Gofer SH8472 Blaengofer SN3425
gogof (see ogof )
golau adj	light, bright	Alltgolau SN5125 Wernolau SN3617
gorffwysfa nf	resting place	Pengorffwysfa SH4692 Gorffwysfa SH2131
goror nm/f gororau, gororion pl	boundary	Gororion SN8773 Oror SJ0847
gorsedd nf	tumulus, barrow, hillock	Gorsedd SJ1576 Yr Orsedd SJ3657
graean nm	gravel	Graeanryd SJ2156 Bwlch y Graean SN3049
gris nm grisiau pl	step	Tanygrisiau SH6845 Esgair Gris SN8868
gro nm/f	gravel; gravel hill	Gronant SJ0983 Ro-wen SH7571
grofft nf grofftau pl	croft	Grofft SH8104 Cefn Rofft SJ0049
grug nm	heath, heather	Cefn-y-grug SO1664 Grugfryn SH8273
grwn nm	ridge between two furrows, ridge in a field	Grwnamlwg SJ1515 Grwn-oer SJ0218
gwaelod nm	foot of hill, bottom	Gwaelod-y-garth ST1183 Gwaelod SJ1416
gwair nm	hay	Llwyngwair SN0739 Pant-y-gwair SN6067
gwal nf gwaliau pl	wall	Rhos-y-gwaliau SH9434 Bryn-y-gwalia SJ1924
gwâl nf	lair	Gwal y Filiast SN1725 Gwal-yr-hwch SN5807
gwar nf	ridge (nape of neck)	Gwar-y-felin SN9335 Gwarallt SN5458
gwartheg np	cows, cattle	Cors y Gwartheg-llwydion SH8032 Dolgwartheg SN4661
gwas nm	youth, servant	Bryn-gwas SS5493 Ynysygwas SS7891
gwastad nm	plain	Gwastadannas SH6553 Gwastad-mawr ST2989
gwastad adj	flat	Gwastad SO2305 Gwastadfryn SH6709
gwaun nf gweunydd pl	moor, mountain meadow, moor-land field, moor-land field	Waunarlwydd SS6095 Abergwaun SM9537
gwden nf	willow-tree, reeds	Glangwden SN9688 Dolgwden SN9589
gweirglodd nf	hay-field, meadow	Gweirglodd-gilfach SH8926 Nantyweirglodd SN2332
gwely nm	bed, resting-place, family land	Gwely'r Misgl SS7880 Pen y Gwely SJ2133
gwen (see gwyn)
gwenith nm	wheat	Bryngwenith SS9682 Dolgwenith SN9887
gwerdd (see gwyrdd)
gwerfa nf	cool spot on mountain side where cattle or sheep seek shade	Werfa SS9194 Bwlch y Werfa SS9283
gwern, gwernog nf	place where alders grow, swamp	Cilgwern SO2414 Pengwern SJ0176
gwernen nf gwern pl	alder tree	Gwernaffield SJ2064 Gwernymynydd SJ2162
gwiber nf	viper	Carregwiber SO0859 Allt y wiber SN4628
gwig nf gwigau pl	grove, wood	Melin-y-wig SJ0348 Cefn-wig SN4761
gwinllan nf	grove (vineyard)	Marianywinllan SH6270 Winllan SJ2121
gwlad nf	region	Coed-y-wlad SJ2209 Cors-y-wlad SH4447
gwlyb adj gwleb f	wet	Gwlybycoed SH4689 Gelli-wlyb SN8824
gwndwn (see gwyndwn )
gwrach nf	hag, witch	Rhyd-y-wrach SN1619 Blaen-gwrach SN8605
gwreiddyn, gwraidd nm gwreiddiau pl	root	Gwreiddyn SH9474 Gwreiddiau SJ0419
gwrych nm	(quickset) hedge	Gwrych Bedw SJ1048 Hen Wrych SH9278
gwryd nm	fathom	Llangwryd-isaf SJ2337 Nantygwryd SH6856
gwter (see cwter )
Gwyddel nm Gwyddyl, Gwyddelod pl	Irishman	Gwyddel SH1425 Gwyddelwern SJ0746
gwydden, gwŷdd nf pl	tree	Llyn y Grinwydden SJ0206 Glanwydden SH8180
gwyddfa nf	mound, tumulus	Yr Wyddfa SH6054 Graig Trewyddfa SS6697
gwylfa nf	look-out point	Gwylfa Hiraethog SH9459 Foel Wylfa SJ1933
gwyn adj gwen f gwynion pl	white	Gaerwen SH4871 Bron-gwyn SN2843
gwyndwn, gwndwn nm	grassland, lea	Gwndwn SN4737 Gwndwngwyn SM9027
gwynt nm	wind	Tre-gwynt SJ0306 Moel y Gwynt SS8598
gwyrdd adj gwerdd f gwyrddion pl	green	Dolaugwyrddon SN5546 Dolwerdd SN4924
gyrfa nf	racecourse	Llannerch-yrfa SN8355 Pant-yr-yrfa ST2593
hafn nf	gorge, ravine	Maeshafn SJ2060 Yr Hafnau SH9738
hafod nf	summer dwelling	Nant-yr-hafod SN8791 Hafod-dywyll SH6815
hafoty nm	summer dwelling	Hafoty SH8365 Hafoty'r Bwlch
haidd nm	barley	Maes-yr-haidd SN5630 Nant-yr-haidd SN9366
halog adj	dirty, muddy	Rhydhalog ST0279 Pwllhalog SJ0877
hardd adj	fine, fair	Pentre-hardd SN5907 Harlech SH5831
haul nm	sun	Bolahaul SN4218 Bron Haul SH9669
hebog nm/f	hawk	Moel Hebog SH5646 Mynydd Pwllyrhebog SS9691
helfa nf	hunting-ground	Dolhelfa SN9273 Helfa SH5857
heli nm	brine	Y Felinheli SH5267 Pwllheli SH3735
helygen nf helyg pl	willow	Llanfihangel Helygen SO0464 Brynhelygen ST0578
hen adj	old	Brynhenllan SN0039 Hendy-gwyn ar daf SN2016
hendre(f) nf	winter dwelling, old home, permanent abode	Capel Hendre SN5911 Hendre SJ1967
heol, hewl nf	street, road	Heol-las SS6998 Heol-y-cyw SS9484
hesgen nf hesg pl	rush	Cwm-hesgen SH7829 Nant Hesgog SN9168
hesgyn nm	bog	Penhesgyn SH5374 Ffridd Cwmhesgyn SH8742
hir adj	long	Ynys-hir ST0292 Pont-hir ST3292
hwch nf	sow, swine	Stryt-yr-hwch SJ3346 Gorsyrhwch SN6633
hwnt adj	yonder	Pentrehwnt SS9275 Tu-hwnt-i'r-afon SH8167
hwrdd nm hyrddod pl	ram	Cornhwrdd SN5402 Llwyn-yr-hwrdd SN2232
hydd nm hyddod pl	stag	Moel-yr-hydd SH6745 Penhydd Fawr SS8093
iet nf	gate	Iet-y-bwlch SN1628 Bwlch-yr-iet SN3021
is pr	below, lower	Bangor Is-coed SJ3945 Is-afon SH9131
isa(f) adj	lowest	Penisa'r-waun SH5563 Llangwryd-isaf SJ2337
isel adj	low	Nant Ffriddisel SJ1241 Ffynnon Isel SJ0421
iwrch nm iyrchod pl	roebuck	Nantiwrch SN7039 Pwlliwrch SH8301
l-	A word starting l may be a mutated form of a word starting ll
lawnt , lawnd nf	open space in woodland , glade	Lawnt SJ0412 Lawnt SJ0465
llaeth nm	milk	Llaethbwlch SJ1116 Wernllaeth SN5165
llaethdy nm	milk-house , dairy	Blaenllaethdy SN0924 Pantllaethdy SN4942
llain nf lleiniau pl	narrow strip of land	Llainfachwen SH5649 Llain-lwyd SN2818
llam nm	leap	Llam Carw SH4593 Llam-march SO2111
llan nf	church , monastery	Llandudno SH7881 Llanelli SN5000
llannerch nf	clearing , glade	Llannerch-y-medd SH4184 Rhosllannerchrugog SJ2946
llawr nm	level area, floor of valley	Llawr-y-glyn SN9391 Llawr-y-cwm-bach SN7185
lle nm	place , position	Lle'r Gaer ST0587 Lle'r-neuaddau SN7584
llech nf llechau pl	slab , stone , rock , rock	Benllech SH5182 Harlech SH5831
llechwedd nf	hillside	Cwmllechwedd SO1375 Llechwedd SH9512
lled nm & pr	breadth; rather , almost , partly	Lledfron SJ1120 Llednant SN9054
lleian nf	nun	Llanlleiana SH3894 Llan Lleian-wen SS6799
llethr nf	slope	Llethr SO0776 Esgair Llethr SN7254
llety nm	small abode , quarters	Bron-llety-Ifan SH6312 Cefn-Pen-llety SJ0336
llidiard , llidiart nm llidiardau , llidiartau pl	gate	Llidiart-cae-hir SJ1430 Llidiardau SN6374
llin nm/f	flax	Pant Llin Bach SH8163 Bryn-llin-fawr SH7729
llo nm lloi pl	calf	Nant Cwm-lloi SH9526 Nant-llo SN3452
lloc nm	fold	Lloc SJ1476 Lloc SH5861
llofft nf	high place (loft)	Llofft-y-bardd SN8953 Llofftyddgleision SN9371
lluest nm	shieling , cottage , hut	Lluest SH9708 Lluest-wen SS8489
llwch nm llychau pl	lake; dust	Amlwch SH4493 Talyllychau SN6332
llwm adj lom f	bare , exposed	Cwm-llwm SH9962 Grinllwm SH7762
llwybr nm	path	Llwybr-hir SJ1275 Penllwybr SN4057
llwyd adj llwydion pl	grey , brown; holy	Pentre Llwyn-llwyd SN9654 Braich Llwyd SH6654
llwyfen nf llwyf pl	elm	Aberllefenni SH7709 Llwyfen SO1521
llwyn nm llwyni , llwynau pl	grove , bush	Llwyngwril SH5909 Llwyndyrys SH3741
llwynog nm	fox	Cwmllwynog SJ0706 Trwyn Llwynog SM8634
llydan adj	broad	Carreglydan SH3271 Cefn-llydan SO0696
llygad nm	source of river or stream (eye)	Llygad-y-cleddau SM9733 Llyn Llygad Rheidol SN7987
llygoden nf llygod pl	mouse	Heol Llygoden SO1729 Tre-pys-llygod SH8868
llym adj llem f	sharp , acute	Carreg Blaen-Llym SH6643 Carreg Lem SN8017
llyn nm/f	lake	Maes-llyn SN3644 Crymlyn ST2198
llynwyn nm	pool , puddle; moat	Bryn Llynwyn-ddwr SS9099 Llynwyn Glas SS9894
llys nm/f	court , hall	Henllys ST2693 Llys-y-frân SN0424
lôn nf	lane , road	Lôn-las SH4240 Lôn SO0267
m-	A word starting m may be a mutated form of a word starting b
ma- , -fa nf	plain , place	Machynlleth SH7400 Gabalfa
mab nm meibion pl	son	Nantymab SN5322 Moel y Mab SJ2405
maen nm meini , main pl	stone	Rhyd-y-main SH8022 Pont-faen SN9934
maenol nf	stone-built residence of chieftain of district ; manor	Maenol SN9583 Faenol-Broper SJ0174
maerdre(f) nf	lord's demesne	Llanilltud Faerdref ST0886 Gwaralltyfaerdre SN4349
maerdy nm	steward's house , dairy	Y Maerdy SS9798 Y Maerdy SJ3015
maes nm meysydd pl	open field , plain	Maes-glas ST3086 Maes-teg SS8591
magwyr nf	(dry) stone wall , hedge ; ruin	Magwyr ST4287 Clwydyfagwyr SO0206
maharen nm meheryn pl	ram , wether	Gellifaharen SN4143 Rhosmeheryn SN8971
main adj	thin , narrow	Gell-fain SN8432 Bylchau Rhos-fain SN7517
main (see maen )
march nm meirch pl	horse , stallion	Rhos-meirch SH4677 Drenewydd Gelli-farch ST4793
marchog nm	knight , horseman	Felindre Farchog SN1039 Marchogdir SN8826
marian nm	holm , gravel , gravelly ground , rock debris	Marian-glas SH5084 Marian Prysau SJ1274
marl nm	marl , chalky clay	Parc-y-marl SN0424 Gwern-y-marl SJ2268
mawn nm	peat	Rhos-y-mawn SH8566 Waun Mawn SN0834
mawnog nf	peat-bog	Mawnog SN7994 Pen Bryn-y-fawnog SH9527
mawr adj	big , great	Llanbadarn Fawr SN6080 Waunfawr SH5359
medd nm	mead	Nant-y-medd SN6150 Llanerchymedd SH4184
meillionen nf meillion pl	clover	Cwm Meillionen SH5648 Maes-meillion SH9230
melin nf	mill	Felin-fach SN5255 Melin-coed SH8160
melindref nf	mill-town	Felindre SO1836 Felindre SN7027
melyn adj melen f	yellow	Trefelen SN0721 Melynllyn SH7065
menyn , ymenyn nm	butter	Brynmenyn SS9084 Dolmenyn SN9649
merch nf	daughter	Afon Merch SH6352 Crugiau Merched SN7245
merddwr nm merched pl	stagnant water	Merddwr SH8950 Banc y Merddwr SH8335
merllyn nm	stagnant pool	Merllyn SJ2668 Merllyn SJ1356
merthyr nm	burial place , church	Merthyr Tudful SO0506 Merthyr Cynog SN9837
meudwy nm	hermit	Ynysymeudwy SN7305 Porth Meudwy SH1625
mh-	A word starting mh may be a mutated form of a word starting p
mign , mignen nf mignedd pl	bog , quagmire	Migneint SH7842 Tal-y-mignedd SH5252
milgi nm	greyhound	Ffynnon Maen Milgi SJ0634 Ffynnon y Milgi SJ1251
miliast nf	greyhound bitch	Gwal y Filiast SN1725 Carnedd y Filiast SH6162
min nm	margin side	Minffordd SH5770 Minffrwd SJ0523
mochyn nm moch pl	pig	Mochdre SH8278 Crug-moch SN3333
moel adj	bare , bald	Nant-y-moel SS9392 Moelfre SH5186
moel nf	bare hill	Y Foel SH9911 Rhyd-y-foel SH9176
morfa nm	marsh , fen	Morfa Bychan SH5437 Morfa Nefyn SH2840
moryd nf	estuary , channel	Afon Foryd SH4457 Foryd SH4559
mur nm muriau pl	wall	Castell Tomen-y-mur SH7038 Mur Melyn SH1728
mwdwl nm	stack , cock of hay	Mwdwl-eithin SH9154 Pen y Mwdwl SH9266
mwnws nm	refuse heap	Rhiw Fwnws SO1653 Castell y Mwnws ST0280
mwyalch , mwyalchen nf	blackbird	Croes-y-mwyalch ST3092 Llechwedd-fwyalchen SH8627
mwyn nm	ore , mine	Rhandir-mwyn SN7843 Rhyd-y-mwyn SJ2066
mynach nm mynych , menych , mynaich pl	monk	Capel Coed-y-mynach SO3402 Ystradmynach ST1494
mynachdy nm	monastic grange	Trwynmynachdy SM6922 Mynachdy SN7995
mynachlog nf	monastery	Mynachlog-ddu SN1430 Mynachlog SJ2367
mynwent nf	churchyard , cemetery	Penyfynwent SH4388 Esgair-fynwent SN5334
mynydd nm	mountain , moorland	Penmynydd SH5074 Gwernymynydd SJ2162
n-	A word starting n may be a mutated form of a word starting d
nant nf nentydd , naint , nannau pl	brook	Nantyffyllon SS8592 Nant-glas SN9965
nant nm nentydd , naint , nannau pl	dingle , glen	Nant-y-moel SS9392 Llanfihangel-y-pennant SH6709
neuadd nf	hall	Llety'r-neuadd SN4728 Llwyneuadd SN8824
newydd adj newydd , newyddion pl	new	Castell Newydd Emlyn SN3040 Y Drenewydd SO1191
ng-	A word starting ng may be a mutated form of a word starting g
ngh-	A word starting ngh may be a mutated form of a word starting c
nh-	A word starting nh may be a mutated form of a word starting t
noddfa nf/m	refuge , shelter , sanctuary	Braich y Noddfa SH1326 Caer Noddfa SN9696
nyth nm/f	nest , inaccessible position	Nyth-grug SO1760 Tap Nyth-yr-eryr SH9021
ochr nf	side , slope	Ochr Cefn SH8449 Ochr Fawr SN7455
odyn nf	kiln	Rhydodyn SN6334 Twynrodyn SO0505
oer adj	cold , exposed	Waun-oer SH7814 Cwm Oergwm SO0623
offeiriad nm	priest	Nantyroffeiriad SO0343 Nantyroffeiriad-fawr SO0343
ogof , gogof nf ogofau , gogofau pl	cave	Bryn-yr-ogof SJ1956 Ogof Ddu SH8921
onllwyn nm	ash grove	Yr Onllwyn SN8310 Onllwyn SN8410
onnen nf onn , ynn pl	ash-tree	Trefonnen ST3483 Rhyd-yr-onnen SH6102
pabell nf pebyll pl	tent , grove	Babell SJ1573 Cilybebyll SN7404
pair nm	cauldron	Bryniau Pair SH8562 Nant-y-pair SN3422
pâl nm	palisaded enclosure	Penrhiwpâl SN3445 Pen-pâl SN5418
palmant nm	paved way	Penpalmant SJ0668 Pen-y-Palmant SJ0475
pandy nm	fulling-mill	Pandy SJ1935 Tonypandy SS9992
pant nm	hollow , valley	Pant-glas SH4747 Cwmsychbant SN4746
panwaun nf panweunydd pl	bog where cotton-grass grows	Panwaun Pen-y-coetgae SN9000 Panwaun Pwll-gwellt SO0401
parc nm parciau , parcau pl	park , field , enclosure	Penparcau SN5880 Cwm-parc SS9596
pedwar num pedair f	four	Pedair Onnen SS9778 Pedair-ffordd SJ1124
pelan nf	knoll , hillock , tump;river bank , sea wall	Pen-y-belan SJ1204 Belan SJ2004
pella(f) adj	farthest	Taipellaf SH9456 Ty Pellaf SH1121
pen nm pennau pl	head , top; end , edge	Pen-y-bont-fawr SJ0824 Penfro SM9801
penrhyn nm	promontory	Penrhyndeudraeth SH6139 Penrhyn-side SH8181
pentre(f) nm	homestead , village	Pentre-bach SN5547 Pentregwenlais SN6016
perfedd nm	middle , midst	Treberfedd SJ3012 Banc Cefnperfedd SO0984
perllan nf	orchard	Berllan SN1239 Berllandawel SN1727
perth nf perthi pl	bush , brake , hedge	Arberth SN1014 Berth-ddu SO0185
ph-	A word starting ph may be a mutated form of a word starting p
pi nf piod pl	magpie	Pentre-piod SH8930 Llwyn-y-piod SN5103
pia nm	magpie	Llwynypia SS9993 Castell y Pia ST1190
pica adj	pointed , sharp	Bryniau Pica SN8066 Llan-pica SO2250
pig nf	point	Pig y Baw SN0140 Nant-y-big SH3025
pigyn nm	point	Pigyn Esgob SH7651 Pigyn Shon-Nicholas SN6635
pistyll nm	spout , waterfall	Pistyll SH3242 Tan-y-pistyll SJ0729
plas nm	hall , mansion	Plas Einion SJ1354 Plas-criafol SJ1131
plwm nm	lead	Nant Felin-blwm SJ1380 Gwaun Ynys-plwm ST0383
plwyf nm	parish	Blaen-plwyf SN5775 Blaen Plwyf Ystrad SN5753
poeth adj	hot , burnt	Cwmfelin-boeth SN1919 Coed-poeth SJ2851
ponc nf ponciau pl	hillock , tump	Pen-y-bonc SH2181 Bonc SJ1637
poncyn , poncen nm, nf	small hillock	Ponciau SJ2946 Clawdd Poncen SJ0744
pont nf	bridge	Pen-y-bont ar Ogwr SN1745 Bontnewydd SH4859
porchell , parchell nm perchyll pl	young pig	Penporchell SH9967 Coed Wernporchell SH6371
porth nm	gate , gateway	Porth-y-rhyd SN5215 Porth-yr-aur SH4762
porth nf	harbour , bay , landing-place , ferry	Porthaethwy SH5572 Porthmadog SH5638
pren nm	tree	Prenteg SH5841 Coed-saithpren SN5223
prys(g) nm	copse , brushwood	Prys-mawr SH8630 Penprysg SS9682
pum(p) num	five	Llanpumsaint SN4129 Pumryd SH8719
'r (see y)
pwlI nm pyllau pl	pit , pool	Llanfair Pwllgwyngyll SH5371 Glasbwll SN7397
r-	A word starting r may be a mutated form of a word starting rh
rhaeadr nf	waterfall	Rhaeadr SN9768 Llanrhaeadr-yng-Nghinmeirch SJ0863
rhandir nm	region , district , measure of land	Rhandir-mwyn SN7843 Rhandir SH8371
rhedyn(n)og nf	fern-brake	Glynrhedynog SS9997 Rhedynog Bellaf SH4138
rhedynen nf rhedyn pl	fern	Rhedyn-coch SH4166 Brynrhedyn SH9764
rhestr nf	row , series	Rhestr Cerrig SN8078 Blaen Rhestr SN8469
rhingyll nm	herald , beadle	Castell-y-rhingyll SN5714 Ffynnon Ringyll ST1089
rhiw nf/m	hill , slope	Rhiwlas SH5765 Troed-y-rhiw SO0702
rhod nf	wheel , orbit	Rhod Isaf SM7023 Rhodmad SN5974
rhos nf rhosydd pl	moor , promontory	Rhosgadfan SH5057 Rhosnesi SJ3450
rhudd adj	red , crimson	Rhuddallt SH6718 Rhuddlan SJ0278
rhyd nf/m	ford	Rhydlydan SH8950 Pont-rhyd-y-fen SS7994
saer nm seiri pl	craftsman	Bryn Saer SJ2769 Glyn Saer SN8442
saeth nf saethau pl	arrow	Rhiwsaeth SJ0722 Bwlchysaethau SH6154
Sais nm Saeson pl	Englishman	Pant-y-Sais SS7194 Cae'r Sais SH2677
sant , san nm saint pl	saint; monk	Pumsaint SN6540 Llantrisant ST0483
sarff nf	serpent	Sarffle SJ1433 Ffynnon Sarff SH2931
sarn nf sarnau pl	causeway	Tal-y-sarn SH4853 Sarnau SN3150
serth adj	steep	Bryn Serth SO1410 Maen-serth SN9469
siambr nf	chamber	Siambr-wen SJ0723 Siambr-gerrig SJ1933
sigl , siglen nf	quagmire	Bwlch Siglen SH8313 Siglen SH7464
simnai , simdde nf	chimney	Porth Simdde SH1626 Cerrig Simdde SH7940
stent nm/f	extent (land)	Tir Stent SH7516 Cil Stent SH7960
sticil , sticill nf	stile	Pontsticill SO0511 Garn Pontsticill SO0511
stryd , stryt nf	way , street	Stryd SH2482 Stryt-cae-rhedyn SJ2660
swch nf	ploughshare , triangular piece of land	Swch-cae-rhiw SJ1335 Swch y Llan SH9348
swllt nm	shilling	Crug y Swllt SN1712 Garn-swllt SN6209
swydd nf	seat , lordship , office	Swyddffynnon SN6966 Rhos-swydd SO1264
sych adj	dry	Cwmsychbant SN4746 Sycharth SJ2025
tafarn nm/f tafarnau pl	tavern	Pentre Tafarn-y-fedw SH8162 Tafarnygelyn SJ1861
tafol np	dock plants	Tafolgraig SN6597 Tafolwern SH8902
tafolog nf	place where dock grows	Blaen-Tafolog SH8909 Tafolog SH8909
tail nm	dung , manure	Bryn Tail ST0989 Bryntail SN9187
tâl nm	end , top	Tal-y-bont SN6589 Talacre SJ1284
talar nf	headland (of field)	Troedrhiwdalar SN9553 Dalarwen SN7850
talch nm	fragment , pounded grain	Cefnbryntalch SO1796 Bryntalch SO1795
talwrn nm talyrni , tylyrni pl	bare exposed hill-side , open space , threshing floor , cockpit	Talwrn SH4977 Talwrn SJ2947
tan, dan pr	under , beneath	Tan-y-fron SH9564 Tan-y-bwlch SH6540
tarren nf tarreni pl	rocky tump	Nant Tarren-fedw-ddu SN7893 Tarren Bwlch-gwyn SN8193
tarw nm teirw pl	bull	Crugtarw SN3734 Mynydd Tarw SJ1132
tas nf	stack , rick	Pen Tas-eithin SN5743 Y Das SO1932
teg adj	fair	Maes-teg SS8591 Llan-teg SN1810
telyn nf	harp	Rhyd-y-delyn Fawr SH5275 Caedelyn SN5806
tew adj	thick , fat	Cors Tewgyll SN1331 Llwyntew SN9428
th-	A word starting th may be a mutated form of a word starting t
tir nm	land , territory	Tirabad SO8741 Brithdir SH7719
tlawd adj tlodion pl	pauper , poor	Tyddyn-tlodion SJ1753 Cae Tlodion SH5925
tom , tomen nf	pile , muck-heap , mound , hillock	Domgae SJ2719 Tomen y Meirw SJ1638
ton , tonnen nf/m tonnau pl	grassland (left unplowed) , lea	Ton-teg ST0986 Tonypandy SS9992
top nm	top	Top-rhiw-fawr SJ1117 Top-y-fron SJ2769
tor nm	break , gap	Tor Glas SO0319 Torbant SM8430
torglwyd nf	door-hurdle , gate	Maestorglwyd SO2137 Dorglwyd SN6500
traeth nm	beach , strand , shore	Malltraeth SH4068 Trefdraeth SN0539
trallwng , trallwm nm	wet low-lying land	Y Trallwng SJ2207 Trallwng SN9629
traws adj & nm	cross, transverse	Trawsgoed SN6773 Trawsfynydd SH7035
tref nf	settlement , hamlet , town	Tre-garth SH6067 Trefalun SJ3856
tri num tair f	three	Tri Chrugiau SN9343 Llantrisant ST0483
trindod nf	trinity	Llandrindod SO0561 Ffynnon-y-drindod SS9373
troed nm/f	base , bottom , (foot)	Allt Troed-y-rhiw SN5235 Troed-rhiw-cymmer SN7648
tros pr	over	Trosnant SO0425 Tros-y-waen SH5666
trum nm trumiau pl	ridge	Trum Gelli SH6501 Cefngeudrum SN7727
trwyn nm	point , cape , (nose)	Trwyn Bendro SM6923 Trwynhwrddyn SM7327
twlch nm tylchau pl	tump , knoll	Cefn-twlch SJ1000 Dôl y Twlch SN8074
twll nm tyllau pl	hole , pit	Twll-y-clawdd SH5073 Ty'n-Twll SJ1055
twmpath nm	tump , hillock	Waun Twmpath SN4602 Twmpath SO0743
tŵr nm	tower	Tre-tŵr SO1821 Twr SH2282
twrch nm tyrchod pl	boar	Twrch Fechan SN7819 Blaen-Twrch SN6849
twyn nm twyni pl	hillock , knoll	Twynrodyn SO0505 Pen-twyn ST5209
tŷ nm tai pl	house	Tŷ-croes SH3472 Pentre Tŷ-gwyn SN8135
tyddyn , ty'n , tyn nm	small farm , holding	Tyn-y-groes SH7771 Ty'n-y-ffridd SJ1130
tyle nm/f	hill , ascent	Maestyle SN5939 Mynydd Tyle-coch SS9396
tylluan nf	owl	Rhosdylluan SH8529 Cwmdylluan SN9588
tyno nm	plain , meadow	Tynohir SN7098 Gwern Tyno SH8477
tywarchen nf tyweirch, tywyrch pl	sod , turf	Llyn-y-dywarchen SH5653 Penrhiwtywarch SN7144
tywyll adj	dark , gloomy	Tywyllnodwydd SH7102 Cildywyll SN2212
tywyn nm	sandy-shore , sand-dune	Tywyn SH7878 Llanfihangel-yn-nhywyn SH3176
uchaf adj	upper , highest	Felin-gwm-uchaf SN5023 Cwm Twrch Uchaf SN7511
uchel adj	high	Bonuchel SJ0857 Gelli-benuchel SN8005
uwch pr	above , over	Llanuwchllyn SH8730 Uwchmynydd SH1525
uwchlaw pr	above	Uwchlaw'r-coed SH6025 Uwchlaw'r-rhos SH4754
wtra nf	lane	Tynwtra SH8505 Tynyrwtra SJ0517
y , yr, 'r (definite article)	the	Y Ferwig SN1849 Bryn-y-maen SH8376
ychen nm ŷch pl	ox	Porthyrychen SH4693 Rhydyrychen SH8648
ymenyn (see menyn)
ymryson nm	contention , disputed ground	Rhos Ymryson SN4650 Esgair Ymryson SN8876
yn , 'n pr	in	Llansanffraid-yn-Elfael SO0954 Ty'n-y-cefn SJ0443
ynys nf ynysoedd pl	island; holm , river-meadow	Coed-yr-ynys SO1520 Ynys-las SN6092
ysbyty nm	hospital , hospice	Ysbyty Ystwyth SN7371 Ysbyty Ifan SH8448
ysgafell nf	ledge , brow	Ysgafell Wen SH6649 Tanysgafell SH6166
ysgallog nf	full of thistles; place where thistles abound	Pantysgallog SN9028 Dolysgallog SH8510
ysgawen , ysgaw nf	elder-tree	Comin Cwmysgawen SO0371 Tre-Ysgawen SH4581
ysgeifiog nf	place of elder-trees	Ysgeifiog SJ1571 Llanfihangel Ysgeifiog SH4773
ysgol nf ysgolion pl	ladder , formation on mountain-side	Ysgolion Duon SH6663 Craig-yr-ysgol SN9502
ysgol nf ysgolion pl	school	Ysgoldy SH4382 Tai'r-ysgol SS6997
ysgubor nf ysguboriau pl	barn	Tyddyn-ysgubor SJ0040 Ysgubor Bach SH1628
ysguthan nf	wood-pigeon	Bryn Ysguthan SH9311 Nant Ysguthan SH9411
ysgwydd nf	shoulder (of mountain)	Ysgwydd Hwch SO0537 Ysgwydd-gwyn-isaf SO1200
ystafell nf	chamber , hiding-place	Ystafelloedd SM7923 Cwm Nant Ystafell SN7108
ystlys nf	side , flank	Ystlys-y-coed-uchaf SN5707 Ystlys-y-coed-isaf SN5606
ystrad nm	valley , holm , river-meadow	Ystrad Rhondda SS9895 Ystradgynlais SN7810
ystum nf/m	bend	Llanystumdwy SH4738 Ystumtuen SN7378
ywen nf yw pl	yew-tree	Careg-ywen SO0052 Llwynywen SN5363