TermCymru

Results are displayed in Welsh alphabetical order A-Y
Welsh: ocsideiddio cemegol
English: chemical oxidation
Status B
Subject: Environment
Part of speech: Verb
Last updated: 4 February 2021
Welsh: ocsideiddio ffotogatalytig
English: photocatalytic oxidation
Status B
Subject: Environment
Part of speech: Verb
Last updated: 4 February 2021
Welsh: ocsidio
English: oxidisation
Status C
Subject: Agriculture
Part of speech: Verb
Last updated: 21 October 2009
Welsh: ocsidio
English: oxidise
Status C
Subject: Agriculture
Part of speech: Verb
Last updated: 21 October 2009
Welsh: ocsid nitrig a fewnanadlir
English: inhaled nitric oxide
Status C
Subject: Health
Part of speech: Noun, Masculine, Singular
Last updated: 13 December 2010
Welsh: ocsid nitrus
English: nitrous oxide
Status A
Subject: Environment
Part of speech: Noun, Masculine, Singular
Plural: ocsidau nitrus
Last updated: 10 February 2022
Welsh: ocsifesurydd pwls
English: pulse oximeter
Status C
Subject: Health
Part of speech: Noun, Masculine, Singular
Last updated: 13 December 2010
Welsh: ocsigen
English: oxygen
Status A
Subject: Environment
Part of speech: Noun, Masculine, Singular
Definition: Symbol cemegol: O
Notes: Elfen gemegol. Gweler y canllawiau sillafu termau benthyg gwyddonol ar BydTermCymru.
Last updated: 18 June 2025
Welsh: ocsigen tawdd
English: dissolved oxygen
Status C
Subject: Environment
Part of speech: Noun, Masculine, Singular
Last updated: 5 June 2006
Welsh: ocsigenu drwy bilen allgorfforol
English: extra-corporal membrane oxygenation
Status C
Subject: Health
Part of speech: Verb
Last updated: 10 January 2003
Welsh: ocsitocic
English: oxytocic
Status B
Subject: Health
Part of speech: Noun, Masculine, Singular
Plural: ocsitocicau
Last updated: 6 November 2019
Welsh: ocsiwn cynyddu pris
English: forward auction
Status B
Subject: ICT
Part of speech: Noun, Feminine, Singular
Plural: ocsiynau cynyddu pris
Definition: The two major types of the electronic auction are forward auction in which several buyers bid for one seller's goods and reverse auction in which several sellers bid for one buyer's order.
Notes: Mae’r term hwn yn ymwneud ag ocsiynau ar-lein yn bennaf. Weithiau defnyddir y term ‘forward eAuction’.
Last updated: 30 November 2015
Welsh: ocsiwn lleihau pris
English: reverse auction
Status B
Subject: ICT
Part of speech: Noun, Feminine, Singular
Plural: ocsiynau lleihau pris
Definition: The two major types of the electronic auction are forward auction in which several buyers bid for one seller's goods and reverse auction in which several sellers bid for one buyer's order.
Notes: Mae’r term hwn yn ymwneud ag ocsiynau ar-lein yn bennaf. Weithiau defnyddir y term ‘reverse eAuction’.
Last updated: 30 November 2015
Welsh: ocso-fioddiraddadwy
English: oxo-biodegradable
Status A
Subject: Environment
Part of speech: Adjective
Definition: Y gallu i ddiraddio o ganlyniad i ffenomena ocsideiddio a ffenomena a gyfryngir gan gelloedd, naill ai ar yr un pryd neu'r naill ar ôl y llall.
Last updated: 13 October 2022
Welsh: OCT
English: OCT
Status B
Subject: Health
Part of speech: Noun, Masculine, Singular
Notes: Prawf diagnostig ym maes optometreg.
Last updated: 4 June 2020
Welsh: octopws
English: octopus
Status A
Subject: Agriculture
Part of speech: Noun, Masculine, Singular
Definition: Teulu’r Octopodidae
Last updated: 19 March 2012
Welsh: octylffenol
English: octylphenol
Status C
Subject: Finance and statistics
Part of speech: Noun, Masculine, Singular
Last updated: 1 November 2010
Welsh: OCVO
English: OCVO
Status A
Subject: Welsh Government posts and departments
Part of speech: Noun, Feminine, Singular
Definition: Office of the Chief Veterinary Officer
Notes: Enw llawn: Swyddfa'r Prif Filfeddyg. Rhan o Grŵp yr Economi, Sgiliau a Chyfoeth Naturiol yn Llywodraeth Cymru. Ychwanegwyd y cofnod hwn Ionawr 2016.
Last updated: 7 January 2016
Welsh: ocwloblasteg
English: oculoplastics
Status B
Subject: Health
Part of speech: Noun, Feminine, Singular
Notes: Yng nghyd-destun optometreg.
Last updated: 25 February 2021
Welsh: o dan
English: under
Status C
Subject: General
Part of speech: Preposition
Last updated: 15 December 2010
Welsh: o dan awdurdod y Gweinidog dros...
English: under the authority of the Minister for...
Status C
Subject: Law
Part of speech: Preposition
Last updated: 30 July 2007
Welsh: o dan eich rheolaeth lwyr chi
English: under your sole management and control
Status C
Subject: Agriculture
Part of speech: Preposition
Last updated: 26 January 2010
Welsh: o dan fygythiad o ddigartrefedd
English: threatened with homelessness
Status A
Subject: Housing
Part of speech: Adjective
Notes: Ymadrodd a ddefnyddir yn y ddeddfwriaeth sy'n ymwneud â thai a digartrefedd.
Last updated: 21 February 2025
Welsh: o dan fygythiad o ddigartrefedd
English: at threat of homelessness
Status A
Subject: Housing
Part of speech: Adjective
Last updated: 16 September 2013
Welsh: o dan wydr / plastig
English: under protection
Status C
Subject: Agriculture
Part of speech: Adjective
Definition: vegetables, fruit etc.
Last updated: 1 September 2004
Welsh: o darddiad naturiol
English: naturally derived
Status A
Subject: Environment
Part of speech: Adjective
Last updated: 10 June 2013
Welsh: oddi ar y fantolen
English: off balance sheet
Status A
Subject: Finance and statistics
Part of speech: Adjective
Definition: Trafodiadau lle nad yw'r cyllid a'r ased yn ymddangos ar y fantolen.
Notes: Term o faes cyfrifyddu.
Last updated: 4 December 2018
Welsh: oddi ar y safle
English: off-site
Status B
Subject: Economic development
Part of speech: Adjective
Notes: Yng nghyd-destun canllawiau i weithleoedd yn sgil COVID-19.
Last updated: 25 June 2020
Welsh: o ddiddordeb hanesyddol neu bensaernïol eithriadol
English: outstanding historic or architectural interest
Status A
Subject: Estates and Cadw
Part of speech: Adjective
Notes: Yng nghyd-destun y ddeddwriaeth ar gyfer henebion ac adeiladau rhestredig.
Last updated: 3 February 2022
Welsh: o ddiddordeb i Gymru yn unig
English: purely Welsh interest
Status B
Subject: Law
Part of speech: Adjective, Masculine, Singular
Definition: As defined in the Gifts to the Nation Scheme.
Last updated: 23 April 2012
Welsh: oddi wrth y cwsmer
English: upstream
Status C
Subject: ICT
Part of speech: Adjective
Definition: Broadband speed eg up to 250 kbps upstream.
Last updated: 22 January 2007
Welsh: o deulu’r ddafad
English: ovine
Status C
Subject: Agriculture
Part of speech: Adjective
Last updated: 29 July 2003
Welsh: ïodin
English: iodine
Status A
Subject: Environment
Part of speech: Noun, Masculine, Singular
Definition: Symbol cemegol: I
Notes: Elfen gemegol. Gweler y canllawiau sillafu termau benthyg gwyddonol ar BydTermCymru.
Last updated: 18 June 2025
Welsh: ODP
English: ODP
Status C
Subject: Health
Part of speech: Neutral
Definition: operating department practitioner
Last updated: 23 September 2004
Welsh: ODPM
English: ODPM
Status A
Subject: Politics
Part of speech: Noun, Feminine, Singular
Definition: Office of the Deputy Prime Minister
Context: Former UK Cabinet post.
Last updated: 21 July 2005
Welsh: o dras Affricanaidd
English: of African descent
Status B
Subject: Personnel
Part of speech: Adjective
Last updated: 25 March 2021
Welsh: ods
English: odds
Status B
Subject: Finance and statistics
Part of speech: Noun, Masculine, Singular
Definition: Disgrifiad o ba mor debygol yw rhywbeth o ddigwydd o’i gymharu â pha mor debygol yw o beidio â digwydd; fel arfer yn cael ei fynegi fel cymhareb megis “3:1”.
Notes: Cymharer â’r term probability / tebygolrwydd.
Last updated: 21 January 2026
Welsh: odyn
English: kiln
Status C
Subject: Environment
Part of speech: Noun, Feminine, Singular
Plural: odynau
Last updated: 2 April 2025
Welsh: odyn droi
English: rotary kiln
Status C
Subject: Environment
Part of speech: Noun, Feminine, Singular
Last updated: 5 September 2003
Welsh: oed datblygiad
English: developmental age
Status A
Subject: Health
Part of speech: Noun, Masculine, Singular
Definition: Oed sy'n cyfateb i'r lefel y bydd unigolyn wedi ei gyrraedd mewn perthynas â'r cerrig milltir datblygiadol arferol (er enghraifft cerdded a siarad) ar gyfer pobl ar yr oed hwnnw. Nid yw o reidrwydd yn cyfateb i oed yr unigolyn hwnnw mewn blynyddoedd ers ei eni.
Last updated: 9 January 2020
Welsh: oedema
English: oedema
Status B
Subject: Health
Part of speech: Noun, Masculine, Singular
Definition: Cyflwr lle bydd hylif dyfrllyd yn casglu yng nghelloedd a cheudodau'r corff.
Last updated: 25 June 2020
Welsh: oedema macwlaidd systoid
English: cystoid macular oedema
Status B
Subject: Health
Part of speech: Noun, Masculine, Singular
Notes: Yng nghyd-destun optometreg. Defnyddir yr acronym CMO yn Saesneg.
Last updated: 25 February 2021
Welsh: oedema macwlaidd systoid
English: CMO
Status B
Subject: Health
Part of speech: Noun, Masculine, Singular
Notes: Yng nghyd-destun optometreg. Dyma'r acronym Saesneg a ddefnyddir am cystoid macular oedema.
Last updated: 25 February 2021
Welsh: oed-gyfeillgar
English: age-friendly
Status B
Subject: Health
Part of speech: Adjective
Last updated: 27 April 2023
Welsh: oedi
English: delay
Status B
Subject: ICT
Part of speech: Verb
Last updated: 19 July 2005
Welsh: oedi
English: defer
Status B
Subject: Justice and order
Part of speech: Verb
Notes: Yn achos dedfrydau ac ati.
Last updated: 19 July 2023
Welsh: oediad
English: delay
Status B
Subject: ICT
Part of speech: Noun, Masculine, Singular
Last updated: 19 July 2005
Welsh: oediad adwy
English: gate delay
Status B
Subject: ICT
Part of speech: Noun, Masculine, Singular
Last updated: 19 July 2005
Welsh: oedi cyn adrodd
English: reporting lag
Status B
Subject: Finance and statistics
Part of speech: Verb
Notes: Term o faes ystadegaeth.
Last updated: 9 December 2020
Welsh: oedi datblygiadol
English: development delay
Status B
Subject: Education
Part of speech: Noun, Masculine, Singular
Last updated: 2 December 2004