English - Welsh Dictionary

 oak - derw
 oak tree - derwen
 oak trees - deri
 oar - rhwyf
 oath - llw
 obedient - ufudd
 obey - ufuddhau
 object - diben
 objectives - nodau
 objector - gwrthwynebydd
 obligation - rhwymedigaeth, dyled
 oblige - gorfodi i
 obliged to - dyledus
 oblivion - angof
 observant - craff
 obvious - amlwg, eglur
 obviously - yn amlwg
 occasions - achlysuron
 October - Hydref
 odd - rhyfedd
 of course - wrth gwrs, wrth reswm
 of every kind - o bob math
 of importance - o bwys
 of no importance - o ddim pwys
 of noble lineage - ucheldras
 of spring - gwanwynol
 off we go - i ffwrdd � ni
 Offa's Dyke - Clawdd Offa
 offend - tarfu
 offer - cynnig, taclau
 offer to do - osio
 office - swyddfa
 official - swyddogol, swyddog
 offspring - epil
 often - yn aml
 oil - olew
 OK - gweddol
 old - hen
 old-womanish - gwrachiaidd
 old age - henoed, henaint
 old man - henwr
 old mansion - henllys
 oldness - hender
 omit - hepgor
 on - ar, ymlaen
 on any account - ar unrhyw gyfrif
 on average - ar gyfartal
 on both sides - o'r ddeutu
 on his oath - ar ei lw
 on the borders - ar gyrion, ar gyrion
 on the edge of - ar fin
 on the outskirts of - ar gyrion
 on the point of - ar fin
 on the point of starving - ar newynu
 on top of - ar ben
 once - unwaith, ar unwaith
 once in a while - bob hyn a hyn
 one - un
 one hundred and ten - can a deg
 one needs - rhaid wrth
 one to the other - y naill wrth y llall
 only - unig, dim ond, yn unig
 open - agor, agored
 open wide - led y pen
 opinion - barn, cyfrif
 opportunities - cyfleusterau
 opportunity - cyfle
 opposite - gyferbyn �
 opposition - gwrthwynebiad
 opposition party - gwrthblaid
 oppressive - llethol
 or - neu
 or not - ai peidio
 or whether - ynteu
 orange - oren
 ordained - actiedig
 order - trefnu, trefn, cywair, gorchymyn, ordro
 orderly - trefnus
 ordinary - cyffredin
 organ - ermyg
 organise - cyfundrefnu
 organised - trefnus
 originality - gwreddioldeb
 other - arall
 otherwise - fel arall
 our - ein
 out of sight - o'r golwg
 outlaw - herwr
 outline - amlinellu
 outside - tu allan, allan, tu fas
 outside half - maswr
 outskirts - ffiniau
 oven - ffwrn, pobty
 over - dros, drossodd
 over there - acw
 overalls - ofyr�ls
 overcome - trechu
 overseas - tramor
 owl - tylluan
 own - perchenogi
 owner - perchennog, perchen
 ox - bustach, ych
 oyster - llymarch
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This dictionary is dedicated to the memory of Emrys Rees of Carmarthen (1918 - 2006).

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