yw

From Proto-Celtic *iwos (“yew”), from Proto-Indo-European *h₁eyHw- (“yew”).


moch

From Proto-Brythonic *mox (“pig”), from Proto-Celtic *mokkus.

(mining) small pumps used underground in coal mines to remove water


stôl

cy-noun

stôl m (plural stoliau or stolion or stôls, not mutable)

stoliau (plural)
stolion (plural)
stôls (plural)
ystôl (alternative)


bwrdd

bwrdd m (plural byrddau or bwrddoedd or byrdd)

byrddau (plural)
bwrddoedd (plural)
byrdd (plural)
bwrdd
fwrdd (soft)
mwrdd
bwrd (alternative)

From Middle Welsh bwrt, from Old English bord (compare Irish bord); doublet of bord.

(mining) suspended scaffolding in a slate-quarry to hold three men against the face of the rock for boring a hole for blasting


cwmni

cwmnïau (plural)
cwmnïoedd (plural)
cwmni
gwmni (soft)
nghwmni
chwmni

From Middle Welsh cwmbni, cwmnhi, borrowed from Middle English compainie, compaygnie.


ffin

From Middle Welsh ffin, from Old Welsh fin, from Proto-Brythonic *fin, a borrowing from Latin finis.


eiliadur

eiliaduron (plural)
eiliadur
heiliadur (prothesis-h)


cylched

cylchedau (plural)
cylched
gylched (soft)
nghylched
chylched

From cylch (“circle, ring; compass, scope, range; circumference”) + -ed.


cefn

cy-noun

cefn m (plural cefnau or cefnoedd or cefnydd)

cefnau (plural)
cefnoedd (plural)
cefnydd (plural)
cefn
gefn (soft)
nghefn
chefn

From Middle Welsh keuen. Related to Breton kein (“back”), Cornish keyn (“back”), Gaulish Cebenna (“ridge, height”) (whence French Cévennes).

ar gefn

in addition to, as a consequence of, with regard to; at the expense of; on top, upon, up to

cefn lloer

full moon; crescent of the moon, half moon

cefnog

backed, having a back; strong, stout brave

yng nghefn

behind one's back, underhand; following, pursuing

(agriculture) ridge (ploughed land between two parallel furrows)


wynebwerth

wynebwerthoedd (plural)
wynebwerth
hwynebwerth (prothesis-h)
wyneb-werth (alternative)

From wyneb (“face”) + gwerth (“worth”). In the contemporary sense of "face value", a calque of the English term.


budd

From Proto-Celtic *boudi (“victory”), compare Old Irish búaid.


gwennol

gwenoliaid (plural)
gwennol
wennol (soft)
ngwennol

From Middle Welsh gwennawl, from Proto-Brythonic *gwennọl (compare Breton gwennel), from Proto-Celtic *wesnālā (whence Old Irish fannall). For sense "frog (in a horse's foot)", compare Ancient Greek χελιδών (khelidṓn).


coelio

cy-verb

coelio (first-person singular present coeliaf)

coeliaf (first-person present singular)
coeliaf (first-person future indicative present singular)
coeli (future indicative present second-person singular)
coelia (future indicative present singular third-person)
coeliwn (first-person future indicative plural present)
coeliwch (future indicative plural present second-person)
coeliant (future indicative plural present third-person)
coelir (future impersonal indicative present)
coeliwn (conditional first-person singular)
coeliwn (first-person imperfect indicative singular)
coelit (conditional second-person singular)
coelit (imperfect indicative second-person singular)
coeliai (conditional singular third-person)
coeliai (imperfect indicative singular third-person)
coeliem (conditional first-person plural)
coeliem (first-person imperfect indicative plural)
coeliech (conditional plural second-person)
coeliech (imperfect indicative plural second-person)
coelient (conditional plural third-person)
coelient (imperfect indicative plural third-person)
coelid (conditional impersonal)
coelid (imperfect impersonal indicative)
coeliais (first-person preterite singular)
coeliaist (preterite second-person singular)
coeliodd (preterite singular third-person)
coeliasom (first-person plural preterite)
coeliasoch (plural preterite second-person)
coeliasant (plural preterite third-person)
coeliwyd (impersonal preterite)
coeliaswn (first-person pluperfect singular)
coeliasit (pluperfect second-person singular)
coeliasai (pluperfect singular third-person)
coeliasem (first-person pluperfect plural)
coeliasech (pluperfect plural second-person)
coeliasent (pluperfect plural third-person)
coeliasid (impersonal pluperfect)
coeliesid (impersonal pluperfect)
coeliwyf (first-person present singular subjunctive)
coeliech (present second-person singular subjunctive)
coelio (present singular subjunctive third-person)
coeliom (first-person plural present subjunctive)
coelioch (plural present second-person subjunctive)
coeliont (plural present subjunctive third-person)
coelier (impersonal present subjunctive)
coelia (imperative second-person singular)
coelied (imperative singular third-person)
coeliwn (first-person imperative plural)
coeliwch (imperative plural second-person)
coelient (imperative plural third-person)
coelier (imperative impersonal)
coelio (noun-from-verb)
coeliedig (participle)
coeliadwy (participle)
coelia i (first-person future singular)
coeliaf i (first-person future singular)
coeli di (future second-person singular)
coelith o (future singular third-person)
e (future singular third-person)
hi (future singular third-person)
coeliff e (future singular third-person)
coeliwn ni (first-person future plural)
coeliwch chi (future plural second-person)
coelian nhw (future plural third-person)
coeliwn i (conditional first-person singular)
coelswn i (conditional first-person singular)
coeliet ti (conditional second-person singular)
coelset ti (conditional second-person singular)
coeliai fo (conditional singular third-person)
fe (conditional singular third-person)
hi (conditional singular third-person)
coelsai fo (conditional singular third-person)
coelien ni (conditional first-person plural)
coelsen ni (conditional first-person plural)
coeliech chi (conditional plural second-person)
coelsech chi (conditional plural second-person)
coelien nhw (conditional plural third-person)
coelsen nhw (conditional plural third-person)
coeliais i (first-person preterite singular)
coelies i (first-person preterite singular)
coeliaist ti (preterite second-person singular)
coeliest ti (preterite second-person singular)
coeliodd o (preterite singular third-person)
e (preterite singular third-person)
hi (preterite singular third-person)
coelion ni (first-person plural preterite)
coelioch chi (plural preterite second-person)
coelion nhw (plural preterite third-person)
coelia (imperative second-person singular)
coeliwch (imperative plural second-person)
coelio
goelio (soft)
nghoelio
choelio


gowt

(agriculture, phytopathology) clubroot, a common disease of cabbages, radishes and turnips


gwregys

gwregysau (plural)
gwregys
wregys (soft)
ngwregys

With metathesis from Old Welsh guecrissou, from Proto-Brythonic *gwö-krissus (“belt”, literally “below-shirt”) (compare Cornish grugys, Breton gouriz), derived from Proto-Celtic *krissus, whence Welsh crys (“shirt”).


cyfrif

From cyf- (“co-, con-”) + rhif (“number”).


cyfran

cyfrannau (plural)
cyfran
gyfran (soft)
nghyfran
chyfran


uniad

uniadau (plural)
uniad
huniad (prothesis-h)


meinwe

meinweoedd (plural)
meinwe
feinwe (soft)


rhych

Inherited from Middle Welsh rych, from Proto-Celtic *ɸrikā, from Proto-Indo-European *perḱ- (“to dig”). Cognate with English furrow and Latin porca (“ridge”).

rhych(i)og

grooved; corrugated; striated; furrowed (brow)

rhychu

to groove; corrugate; striate; furrow (brow)


siwt

cy-noun

siwt m or f (plural siwtiau, not mutable)

Borrowed from Middle English sute. Doublet of sut.


newidydd

newidydd m (plural newidyddion, not mutable)

From newid (“to change, to transform”) + -ydd (“-er”).

af

electrical engineering
electrical engineering

(physics, electrical engineering) transformer


anwythydd

anwythyddion (plural)
anwythydd
hanwythydd (prothesis-h)

/aˈnʊɨ̯θɨ̞ð/

From anwytho (“to induce; to induct”) + -ydd.


adlog

cy-noun

adlog m (usually uncountable, plural adlogau)

adlogau (plural)
adlog
hadlog (prothesis-h)


masnachfraint

masnachfraint f (plural masnachfreintiau)

masnachfreintiau (plural)
masnachfraint
fasnachfraint (soft)

From masnach (“trade, commerce”) + braint (“privilege, right”).


adnau

adneuon (plural)
adnau
hadnau (prothesis-h)

Cognate with Old Irish aithne (“entrusting, thing entrusted”).


adneuo

cy-verb

adneuo (first-person singular present adneuaf)

adneuaf (first-person present singular)
adneuaf (first-person future indicative present singular)
adneui (future indicative present second-person singular)
adneua (future indicative present singular third-person)
adneuwn (first-person future indicative plural present)
adneuwch (future indicative plural present second-person)
adneuant (future indicative plural present third-person)
adneuir (future impersonal indicative present)
adneuwn (conditional first-person singular)
adneuwn (first-person imperfect indicative singular subjunctive)
adneuit (conditional second-person singular)
adneuit (imperfect indicative second-person singular subjunctive)
adneuai (conditional singular third-person)
adneuai (imperfect indicative singular subjunctive third-person)
adneuem (conditional first-person plural)
adneuem (first-person imperfect indicative plural subjunctive)
adneuech (conditional plural second-person)
adneuech (imperfect indicative plural second-person subjunctive)
adneuent (conditional plural third-person)
adneuent (imperfect indicative plural subjunctive third-person)
adneuid (conditional impersonal)
adneuid (imperfect impersonal indicative subjunctive)
adneuais (first-person preterite singular)
adneuaist (preterite second-person singular)
adneuodd (preterite singular third-person)
adneuasom (first-person plural preterite)
adneuasoch (plural preterite second-person)
adneuasant (plural preterite third-person)
adneuwyd (impersonal preterite)
adneuaswn (first-person pluperfect singular)
adneuasit (pluperfect second-person singular)
adneuasai (pluperfect singular third-person)
adneuasem (first-person pluperfect plural)
adneuasech (pluperfect plural second-person)
adneuasent (pluperfect plural third-person)
adneuasid (impersonal pluperfect)
adneuesid (impersonal pluperfect)
adneuwyf (first-person present singular subjunctive)
adneuych (present second-person singular subjunctive)
adneuo (present singular subjunctive third-person)
adneuom (first-person plural present subjunctive)
adneuoch (plural present second-person subjunctive)
adneuont (plural present subjunctive third-person)
adneuer (impersonal present subjunctive)
adneua (imperative second-person singular)
adneued (imperative singular third-person)
adneuwn (first-person imperative plural)
adneuwch (imperative plural second-person)
adneuent (imperative plural third-person)
adneuer (imperative impersonal)
adneuo (noun-from-verb singular)
adneuedig (participle singular)
adneuadwy (participle singular)
adneua i (first-person future singular)
adneuaf i (first-person future singular)
adneui di (future second-person singular)
adneuith o (future singular third-person)
e (future singular third-person)
hi (future singular third-person)
adneuiff e (future singular third-person)
adneuwn ni (first-person future plural)
adneuwch chi (future plural second-person)
adneuan nhw (future plural third-person)
adneuwn i (conditional first-person singular)
adneuswn i (conditional first-person singular)
adneuet ti (conditional second-person singular)
adneuset ti (conditional second-person singular)
adneuai fo (conditional singular third-person)
fe (conditional singular third-person)
hi (conditional singular third-person)
adneusai fo (conditional singular third-person)
adneuen ni (conditional first-person plural)
adneusen ni (conditional first-person plural)
adneuech chi (conditional plural second-person)
adneusech chi (conditional plural second-person)
adneuen nhw (conditional plural third-person)
adneusen nhw (conditional plural third-person)
adneuais i (first-person preterite singular)
adneues i (first-person preterite singular)
adneuaist ti (preterite second-person singular)
adneuest ti (preterite second-person singular)
adneuodd o (preterite singular third-person)
e (preterite singular third-person)
hi (preterite singular third-person)
adneuon ni (first-person plural preterite)
adneuoch chi (plural preterite second-person)
adneuon nhw (plural preterite third-person)
adneua (imperative second-person singular)
adneuwch (imperative plural second-person)
adneuo
hadneuo (prothesis-h)


sgrin wynt

cy-noun

sgrin wynt f (plural sgriniau gwynt, not mutable)


godre

godreon (plural)
godre
odre (soft)
ngodre

clymu godre'r cymylau

to stop the rains; to knot the edge of the clouds

codi godre rhywun

to embarrass someone; to lift someone's skirt


buarth

buarthau (plural)
buarth
fuarth (soft)
muarth

From Proto-Celtic *bougortos. Synchronically analysable as bu (“cow”) + garth (“enclosure”).


crychiad

crychiadau (plural)
crychiad
grychiad (soft)
nghrychiad
chrychiad

(agriculture, phytopathology) curl, plant disease that causes leaves to shrivel, esp. Potato leafroll virus


menter

Borrowed from English venture, back-formed with /m/ because /v/ is its soft mutation as in mantais (“advantage”), melfed (“velvet”).


trosglwyddiad

trosglwyddiad m (plural trosglwyddiadau)

trosglwyddiadau (plural)
trosglwyddiad
drosglwyddiad (soft)
nhrosglwyddiad
throsglwyddiad


ardir

âr (“arable land, tillage”) + tir (“land”).


âr

From Proto-Indo-European *h₂erh₃- (“to plough”).

inh

(agriculture) tillage, cultivation of arable land


ffas

cy-noun

ffas f or m (plural ffasys or ffasau, not mutable)


arnodd

arnoddau (plural)
arnodd
harnodd (prothesis-h)
arnod (alternative)
arnol (alternative)


cwlltwr

cylltyrau (plural)
cwlltwr
gwlltwr (soft)
nghwlltwr
chwlltwr
cwlltr (alternative)

From Middle Welsh cwlltyr, from Proto-Brythonic *kultr (compare Middle Breton coultr), from Latin culter (“knife”).

(agriculture) coulter (part of a plough)


haeddel

haeddel f (plural haeddeli or haeddeliau or haeddelion, not mutable)

haeddeli (plural)
haeddeliau (plural)
haeddelion (plural)

From Old Welsh edil, from Proto-Brythonic *haɣeðl, from Proto-Celtic *segetlā, from Proto-Indo-European *seǵʰ- (“to grasp”). Cognate with Breton hael.


haeddel fach

haeddel fach f (plural haeddeli bach, not mutable)

haeddel (“plough-handle”) + bach (“small, little”).

(agriculture) ploughstaff, (lesser handle of a plough)


haeddel fawr

haeddel fawr f (plural haeddeli mawr, not mutable)

haeddel (“plough-handle”) + mawr (“big, great”).

(agriculture) ploughtail, master-handle of a plough


osgled

osgledau (plural)
osgled
hosgled (prothesis-h)

osg (“sloping object”) + lled (“width”).


uniad meitr

uniadau meitr (plural)
uniad meitr
huniad meitr (prothesis-h)


uniad meitrog

uniad meitrog m (plural uniadau meitrog)

uniadau meitrog (plural)
uniad meitrog
huniad meitrog (prothesis-h)


meitrog

cy-adj

meitrog (feminine singular meitrog, plural meitrogion, not comparable)

meitrog (feminine singular)
meitrogion (plural)
meitrog
feitrog (soft)


sgaffald

cy-noun

sgaffald m (plural sgaffaldau or sgaffaldiau, not mutable)

sgaffaldau (plural)
sgaffaldiau (plural)


uniad hanerog

uniad hanerog m (plural uniadau hanerog)

uniadau hanerog (plural)
uniad hanerog
huniad hanerog (prothesis-h)


uniad haneru

uniadau haneru (plural)
uniad haneru
huniad haneru (prothesis-h)


uniad cynffonnog

uniad cynffonnog m (plural uniadau cynffonnog)

uniadau cynffonnog (plural)
uniad cynffonnog
huniad cynffonnog (prothesis-h)


uniad hoelbren

uniad hoelbren m (plural uniadau hoelbren)

uniadau hoelbren (plural)
uniad hoelbren
huniad hoelbren (prothesis-h)


uniad bôn

uniadau bôn (plural)
uniad bôn
huniad bôn (prothesis-h)


uniad ffrâm

uniadau ffrâm (plural)
uniad ffrâm
huniad ffrâm (prothesis-h)


uniad bagl

uniadau bagl (plural)
uniad bagl
huniad bagl (prothesis-h)

uniad (“joint”) + bagl (“crook, crutch”).


uniad rhigol

uniadau rhigol (plural)
uniad rhigol
huniad rhigol (prothesis-h)


uniad tafod a rhigol

uniad tafod a rhigol m (plural uniadau tafod a rhigol)

uniadau tafod a rhigol (plural)
uniad tafod a rhigol
huniad tafod a rhigol (prothesis-h)

uniad (“joint”) + tafod (“tongue”) + rhigol (“groove”).

tongue and groove joint
tongue and groove joint


uniad tafod a rhych

uniad tafod a rhych m (plural uniadau tafod a rhych)

uniadau tafod a rhych (plural)
uniad tafod a rhych
huniad tafod a rhych (prothesis-h)

uniad (“joint”) + tafod (“tongue”) + rhych (“groove”).


uniad mortais a thyno

uniad mortais a thyno m (plural uniadau mortais a thyno)

uniadau mortais a thyno (plural)
uniad mortais a thyno
huniad mortais a thyno (prothesis-h)

uniad (“joint”) + mortais (“mortise”) + tyno (“tenon”).

mortise and tenon joint
mortise and tenon joint


rhigol

rhigol f or m (plural rhigolau or rhigolydd or rhigolion)

rhigolau (plural)
rhigolydd (plural)
rhigolion (plural)


fectoru

cy-verb

fectoru (first-person singular present fectoraf, not mutable)

fectoraf (first-person present singular)
fectoraf (first-person future indicative present singular)
fectori (future indicative present second-person singular)
fectora (future indicative present singular third-person)
fectorwn (first-person future indicative plural present)
fectorwch (future indicative plural present second-person)
fectorant (future indicative plural present third-person)
fectorir (future impersonal indicative present)
fectorwn (conditional first-person singular)
fectorwn (first-person imperfect indicative singular subjunctive)
fectorit (conditional second-person singular)
fectorit (imperfect indicative second-person singular subjunctive)
fectorai (conditional singular third-person)
fectorai (imperfect indicative singular subjunctive third-person)
fectorem (conditional first-person plural)
fectorem (first-person imperfect indicative plural subjunctive)
fectorech (conditional plural second-person)
fectorech (imperfect indicative plural second-person subjunctive)
fectorent (conditional plural third-person)
fectorent (imperfect indicative plural subjunctive third-person)
fectorid (conditional impersonal)
fectorid (imperfect impersonal indicative subjunctive)
fectorais (first-person preterite singular)
fectoraist (preterite second-person singular)
fectorodd (preterite singular third-person)
fectorasom (first-person plural preterite)
fectorasoch (plural preterite second-person)
fectorasant (plural preterite third-person)
fectorwyd (impersonal preterite)
fectoraswn (first-person pluperfect singular)
fectorasit (pluperfect second-person singular)
fectorasai (pluperfect singular third-person)
fectorasem (first-person pluperfect plural)
fectorasech (pluperfect plural second-person)
fectorasent (pluperfect plural third-person)
fectorasid (impersonal pluperfect)
fectoresid (impersonal pluperfect)
fectorwyf (first-person present singular subjunctive)
fectorych (present second-person singular subjunctive)
fectoro (present singular subjunctive third-person)
fectorom (first-person plural present subjunctive)
fectoroch (plural present second-person subjunctive)
fectoront (plural present subjunctive third-person)
fectorer (impersonal present subjunctive)
fectora (imperative second-person singular)
fectored (imperative singular third-person)
fectorwn (first-person imperative plural)
fectorwch (imperative plural second-person)
fectorent (imperative plural third-person)
fectorer (imperative impersonal)
fectoru (noun-from-verb singular)
fectoredig (participle singular)
fectora i (first-person future singular)
fectoraf i (first-person future singular)
fectori di (future second-person singular)
fectorith o (future singular third-person)
e (future singular third-person)
hi (future singular third-person)
fectoriff e (future singular third-person)
fectorwn ni (first-person future plural)
fectorwch chi (future plural second-person)
fectoran nhw (future plural third-person)
fectorwn i (conditional first-person singular)
fectorswn i (conditional first-person singular)
fectoret ti (conditional second-person singular)
fectorset ti (conditional second-person singular)
fectorai fo (conditional singular third-person)
fe (conditional singular third-person)
hi (conditional singular third-person)
fectorsai fo (conditional singular third-person)
fectoren ni (conditional first-person plural)
fectorsen ni (conditional first-person plural)
fectorech chi (conditional plural second-person)
fectorsech chi (conditional plural second-person)
fectoren nhw (conditional plural third-person)
fectorsen nhw (conditional plural third-person)
fectorais i (first-person preterite singular)
fectores i (first-person preterite singular)
fectoraist ti (preterite second-person singular)
fectorest ti (preterite second-person singular)
fectorodd o (preterite singular third-person)
e (preterite singular third-person)
hi (preterite singular third-person)
fectoron ni (first-person plural preterite)
fectoroch chi (plural preterite second-person)
fectoron nhw (plural preterite third-person)
fectora (imperative second-person singular)
fectorwch (imperative plural second-person)
fectoru


isorsaf

isorsafoedd (plural)
isorsaf
hisorsaf (prothesis-h)

(electrical engineering) electrical substation


newidydd codi

cy-noun

newidydd codi m (plural newidyddion codi, not mutable)

(physics, electrical engineering) step-up transformer


newidydd gostwng

newidydd gostwng m (plural newidyddion gostwng, not mutable)

step-down transformer
step-down transformer

(physics, electrical engineering) step-down transformer


gwiced

gwicedau (plural)
gwiced
wiced (soft)
ngwiced
wiced (alternative)


llorp

llorp f (plural llorpiau or llorpau, diminutive llorpen or llorpyn)

llorpiau (plural)
llorpau (plural)
llorpen (diminutive)
llorpyn (diminutive)
llorp
lorp (soft)

(carpentry) rail, stringer or stile of a ladder (one of the vertical components supporting the rungs)


dwbled

dwbledau (plural)
dwbledi (plural)
dwbled
ddwbled (soft)
nwbled

Borrowed from English doublet, from Old French doublet.


anwe

anweoedd (plural)
anwe
hanwe (prothesis-h)


ymylwe

ymylwe f (countable and uncountable, plural ymylweoedd)

ymylweoedd (plural)
ymylwe
hymylwe (prothesis-h)


siprys

(agriculture) dredge, bullimong (mixture of barley and oats)


chwelydr

chwelydr f (plural chwelydrau, not mutable)

Related to dymchwel(yd) (“to turn over”).


llog

llog m (usually uncountable, plural llogau)


llog syml

llog syml m (usually uncountable, plural llogau syml)

llogau syml (plural)
llog syml
log syml (soft)


llog sengl

llog sengl m (usually uncountable, plural llogau sengl)

llogau sengl (plural)
llog sengl
log sengl (soft)


sawd

sawd m (plural sawdiau or sawdion, not mutable)

Variant form of sawdd, cf. ansawd from ansawdd (“quality, condition”).


lluosiad

lluosiadau (plural)
lluosiad
luosiad (soft)


lluosogiad

lluosogiadau (plural)
lluosogiad
luosogiad (soft)


Dirwasgiad Mawr

y Dirwasgiad Mawr (canonical masculine)
Dirwasgiad Mawr
Ddirwasgiad Mawr (soft)
Nirwasgiad Mawr

(economics, business, finance, historical) the Great Depression


rhaniad

rhaniadau (plural)
rhaniad
raniad (soft)

distribution, apportionment
(finance) share (in company)

distribution, apportionment
share (in company)

distribution, apportionment
(finance) dividend