TermCymru

Results are displayed in Welsh alphabetical order A-Y

Welsh: sylfaenu

English: base

Status B

Subject: Finance and statistics

Part of speech: Verb

Definition: Gosod y sampl (y sylfaen) a ddefnyddir wrth wneud cyfrifiad.

Last updated: 3 August 2023

Welsh: Sylfaen y Dreth Gyngor

English: Council Tax Base

Status C

Subject: Housing

Part of speech: Noun, Feminine, Singular

Last updated: 1 December 2003

Welsh: Sylfeini a Chyfleoedd Llwyddiannus

English: Successful Foundations and Opportunities

Status C

Subject: Finance and statistics

Part of speech: Noun, Plural

Definition: Teitl cyllideb

Last updated: 7 January 2008

Welsh: Sylfeini Allforio

English: Foundations for Export

Status C

Subject: Economic development

Part of speech: Noun, Plural

Definition: Rhaglen Cymorth Allforio

Last updated: 13 July 2006

Welsh: sylfeini busnes

English: business foundations

Status C

Subject: Economic development

Part of speech: Noun, Plural

Last updated: 3 February 2006

Welsh: Sylfeini Cadarn: Strategaeth Buddsoddi Cyfalaf i Gymru

English: Firm Foundations: A Capital Investment Strategy for Wales

Status A

Subject: Economic development

Part of speech: Noun, Plural

Definition: Teitl dogfen.

Last updated: 20 February 2006

Welsh: sylffonad perfflowrooctan

English: perflourooctane sylphonate

Status C

Subject: Environment

Part of speech: Noun, Masculine, Singular

Last updated: 22 November 2006

Welsh: sylffwr

English: sulphur

Status A

Subject: Environment

Part of speech: Noun, Masculine, Singular

Definition: Symbol cemegol: S

Notes: Elfen gemegol. Gweler y canllawiau sillafu termau benthyg gwyddonol ar BydTermCymru. Gwelir y sillafiad Saesneg sulfur hefyd.

Last updated: 18 June 2025

Welsh: sylffwr

English: sulfur

Status A

Subject: Environment

Part of speech: Noun, Masculine, Singular

Definition: Symbol cemegol: S

Notes: Elfen gemegol. Gweler y canllawiau sillafu termau benthyg gwyddonol ar BydTermCymru. Gwelir y sillafiad Saesneg sulphur hefyd.

Last updated: 18 June 2025

Welsh: sylffwr deuocsid

English: sulphur dioxide

Status A

Subject: Environment

Part of speech: Noun, Masculine, Singular

Last updated: 11 July 2019

Welsh: syllwr

English: viewer

Status C

Subject: ICT

Part of speech: Noun, Masculine, Singular

Context: Software.

Last updated: 12 November 2014

Welsh: syllwr PDF

English: PDF viewer

Status A

Subject: ICT

Part of speech: Noun, Masculine, Singular

Definition: Portable Document Format

Last updated: 28 May 2014

Welsh: sylos

English: xylose

Status B

Subject: Environment

Part of speech: Noun, Masculine, Singular

Notes: Math o siwgwr.

Last updated: 31 October 2023

Welsh: sylw

English: comment

Status A

Subject: Law

Part of speech: Noun, Masculine, Singular

Plural: sylwadau

Definition: mynegiant cryno o farn ar rywbeth

Context: caniateir i sylwadau (gan gynnwys sylwadaethau neu gwestiynau) gael eu cyflwyno i’r awdurdod sylweddau peryglus

Notes: Os defnyddir 'sylw(adau)' i gyfleu 'representation(s)' a bod angen gair arall am 'comment(s)' gellir defnyddio 'sylwadaeth(au)' (eb) ar gyfer 'comment(s)' er mwyn gwahaniaethu rhyngddynt

Last updated: 8 July 2021

Welsh: sylw

English: representation

Status A

Subject: Law

Part of speech: Noun, Masculine, Singular

Plural: sylwadau

Definition: datganiad ffurfiol a wneir i awdurdod gyda'r bwriad o ddylanwadu ar fater

Context: Wrth ystyried y mater, rhaid i’r dyfarnwr ystyried unrhyw sylwadau ysgrifenedig a gyflwynir mewn ymateb i gais o dan baragraff (6), ond dim ond os cânt eu cyflwyno o fewn y cyfnod penodedig

Notes: Fel arfer yn y ffurf luosog. Os defnyddir 'sylw(adau)' i gyfleu 'representation(s)' mewn dogfen a bod angen gair arall am 'comment(s)' gellir defnyddio 'sylwadaeth(au)' (eb) ar gyfer 'comment(s)' er mwyn gwahaniaethu rhyngddynt.

Last updated: 14 September 2021

Welsh: sylwadau anffurfiol

English: informal commentary

Status C

Subject: Law

Part of speech: Noun, Plural

Definition: Nodiadau answyddogol a baratowyd gan y Llywodraeth ar ddarnau o ddeddfwriaeth arfaethedig.

Last updated: 4 June 2004

Welsh: sylwadau cyffredinol

English: general comments

Status A

Subject: Personnel

Part of speech: Noun, Plural

Last updated: 18 January 2005

Welsh: sylwadau ysgrifenedig

English: written representation

Status C

Subject: Planning

Part of speech: Noun, Plural

Last updated: 23 July 2003

Welsh: sylw andwyol

English: adverse comment

Status C

Subject: Law

Part of speech: Noun, Masculine, Singular

Context: Mesur Arfaethedig y Gymraeg.

Last updated: 1 September 2010

Welsh: sylw ar y cyd

English: joint attention

Status C

Subject: Education

Part of speech: Noun, Masculine, Singular

Definition: Joint attention is the shared focus of two individuals on an object. It is achieved when one individual alerts another to an object by means of eye-gazing, pointing or other verbal or non-verbal indications. An individual gazes at another individual, points to an object and then returns their gaze to the individual.

Context: Mae Therapyddion Lleferydd ac Iaith yn annog amryfal strategaethau ar gyfer rhyngweithio rhwng oedolion a phlant. Mae'r rhain yn cynnwys hyrwyddo sylw ar y cyd drwy ddilyn esiampl y plentyn, modelu iaith gyfoethog, ailadrodd yr hyn a ddywed y plentyn ac ymhelaethu arno, a monitro nifer y cwestiynau a'r cyfarwyddiadau.

Last updated: 12 October 2016

Welsh: sylw ar y cyd

English: shared attention

Status A

Subject: Education

Part of speech: Noun, Masculine, Singular

Definition: Sylw sy'n cael ei dalu gan ddau neu ragor o bobl i'r un gwrthrych, person neu weithred, a phan fydd pawb yn ymwybodol o ddiddordeb y lleill.

Notes: Mae'r term Saesneg 'joint attention' yn gyfystyr.

Last updated: 9 January 2020

Welsh: sylw ar y cyd

English: joint attention

Status A

Subject: Education

Part of speech: Noun, Masculine, Singular

Definition: Sylw sy'n cael ei dalu gan ddau neu ragor o bobl i'r un gwrthrych, person neu weithred, a phan fydd pawb yn ymwybodol o ddiddordeb y lleill.

Notes: Mae'r term Saesneg 'shared attention' yn gyfystyr.

Last updated: 9 January 2020

Welsh: Sylwch ac Eilyddiwch

English: Recognise and Remove

Status A

Subject: Health

Part of speech: Proper noun

Context: Advice for concussed players.

Last updated: 15 April 2014

Welsh: sylw dyladwy

English: due regard

Status B

Subject: Law

Part of speech: Noun, Masculine, Singular

Notes: Mewn llawer iawn o gyd-destunau cyffredinol, mae’n debyg y byddai ‘sylw dyledus’ yn fwy arferedig. Gweler y nodyn am y term ‘due'.

Last updated: 25 July 2022

Welsh: sylwebaeth

English: commentary

Status C

Subject: Culture and the arts

Part of speech: Noun, Feminine, Singular

Definition: on a game, race etc.

Last updated: 4 June 2004

Welsh: sylwebu

English: commentate

Status C

Subject: Culture and the arts

Part of speech: Verb

Last updated: 4 June 2004

Welsh: sylwedd

English: substance

Status B

Subject: Environment

Part of speech: Noun, Masculine, Singular

Plural: sylweddau

Definition: Yn gyffredinol ym maes gwyddoniaeth, unrhyw fater sydd â màs ac sy'n cymryd gofod. Yn benodol ym maes cemeg, unrhyw ddeunydd ac iddo gyfansoddiad cemegol penodol.

Notes: Yn ogystal â'r defnydd gwyddonol, gellir defnyddio'r gair 'substance'/'sylwedd' i gyfeirio at bethau fel alcohol a chyffuriau, a gellir ei ddefnyddio i gyfeirio'n drosiadol i sôn am y prif beth y cyfansoddir rhywbeth ohono (ee 'sylwedd y ddadl').

Last updated: 16 September 2024

Welsh: sylwedd anweddol

English: volatile substance

Status C

Subject: Social services

Part of speech: Noun, Masculine, Singular

Last updated: 27 January 2004

Welsh: sylweddau â blaenoriaeth

English: priority substances

Status C

Subject: Environment

Part of speech: Noun, Plural

Last updated: 1 November 2010

Welsh: sylweddau dan reolaeth

English: controlled substances

Status C

Subject: Justice and order

Part of speech: Noun, Plural

Last updated: 1 September 2010

Welsh: sylweddau gwaharddedig

English: prohibited substances

Status C

Subject: Agriculture

Part of speech: Noun, Plural

Last updated: 29 July 2003

Welsh: sylweddau peryglus

English: hazardous substances

Status C

Subject: Waste

Part of speech: Noun, Plural

Last updated: 23 July 2003

Welsh: sylweddau peryglus

English: dangerous substances

Status C

Subject: Health

Part of speech: Noun, Plural

Last updated: 17 May 2011

Welsh: sylweddau peryglus â blaenoriaeth

English: priority hazardous substances

Status C

Subject: Environment

Part of speech: Noun, Plural

Last updated: 1 November 2010

Welsh: sylweddau poly- a perfflworoalcyl

English: poly- and perfluoroalkyl substances

Status B

Subject: Environment

Part of speech: Noun, Plural

Notes: Cemegau â phriodweddau gwrth-staen, gwrth-ddŵr a gwrthsticio sydd yn lygryddion parhaus yn yr amgylchedd.

Last updated: 8 September 2025

Welsh: sylweddau poly- a perfflworoalcyl

English: PFAS

Status B

Subject: Environment

Part of speech: Noun, Plural

Notes: Dyma’r acronym Saesneg a ddefnyddir am poly- and perfluoroalkyl substances, cemegau â phriodweddau gwrth-staen, gwrth-ddŵr a gwrthsticio sydd yn lygryddion parhaus yn yr amgylchedd.

Last updated: 8 September 2025

Welsh: sylwedd a wenwynwyd

English: poisoned substance

Status A

Subject: Agriculture

Part of speech: Noun, Masculine, Singular

Plural: sylweddau a wenwynwyd

Last updated: 21 July 2022

Welsh: sylwedd carsinogenaidd

English: carcinogenic substance

Status C

Subject: Health

Part of speech: Noun, Masculine, Singular

Last updated: 1 September 2010

Welsh: sylwedd cyflasu

English: flavouring substance

Status B

Subject: Food

Part of speech: Noun, Masculine, Singular

Plural: sylweddau cyflasu

Last updated: 17 April 2024

Welsh: sylwedd gelio

English: gelling agent

Status A

Subject: Food

Part of speech: Noun, Masculine, Singular

Last updated: 8 March 2012

Welsh: sylwedd gwella blas

English: flavour enhancer

Status B

Subject: Food

Part of speech: Noun, Masculine, Singular

Last updated: 31 January 2012

Welsh: sylwedd gwella treuliadwyedd

English: digestibility enhancer

Status B

Subject: Agriculture

Part of speech: Noun, Masculine, Singular

Plural: sylweddau gwella treuliadwyedd

Context: Mae’r paratoad a bennir yn y tabl, sy’n perthyn i’r categori ychwanegion “ychwanegion sootechnegol” ac i’r grŵp gweithredol “sylweddau gwella treuliadwyedd”, wedi ei awdurdodi fel ychwanegyn mewn maeth anifeiliaid yn ddarostyngedig i’r amodau a nodir yn y tabl.

Notes: Daw'r testun cyd-destunol o Reoliadau Ychwanegion Bwyd Anifeiliaid (Awdurdodiadau) (Cymru) 2022.

Last updated: 10 December 2024

Welsh: sylwedd gwenwynig

English: poisonous substance

Status A

Subject: Agriculture

Part of speech: Noun, Masculine, Singular

Plural: sylweddau gwenwynig

Last updated: 21 July 2022

Welsh: sylwedd llesgáu

English: stupefeying substance

Status A

Subject: Agriculture

Part of speech: Noun, Masculine, Singular

Plural: sylweddau llesgáu

Definition: Sylwedd a roddir i anifail er mwyn amharu ar lefel ei ymwybyddiaeth a peri iddo golli'r gallu i ymateb i stimwli.

Last updated: 21 July 2022

Welsh: sylwedd llygru

English: polluting substance

Status C

Subject: Environment

Part of speech: Noun, Masculine, Singular

Last updated: 23 September 2004

Welsh: sylwedd meddwol

English: intoxicating substance

Status B

Subject: Health

Part of speech: Noun, Masculine, Singular

Plural: sylweddau meddwol

Definition: Alcohol neu unrhyw sylwedd neu gynnyrch arall all gael ei ddefnyddio i achosi meddwdod (naill ai drwy ei fewnanadlu ef neu ei darth, neu fel arall), ac nad yw'n gyffur rheoledig fel y'i diffiniwyd gan adran 2 o Ddeddf Camddefnyddio Cyffuriau 1971.

Notes: Seiliwyd y diffiniad ar y Cod Dedfrydu.

Last updated: 27 January 2026

Welsh: sylweddol gaeedig

English: substantially enclosed

Status C

Subject: Law

Part of speech: Adjective

Definition: public place

Last updated: 18 July 2006

Welsh: sylwedd perfflworoalcyl

English: perfluoroalkyl substance

Status B

Subject: Environment

Part of speech: Noun, Masculine, Singular

Plural: sylweddau perfflworoalcyl

Last updated: 8 September 2025

Welsh: sylwedd peryglus a darniweidiol

English: hazardous and noxious substance

Status B

Subject: Environment

Part of speech: Noun, Masculine, Singular

Plural: sylweddau peryglus a darniweidiol

Definition: Sylwedd heblaw olew sy’n debygol, os cyflwynir ef i’r amgylchedd forol, o beryglu iechyd dynol, niweidio adnoddau byw a bywyd morol, difrodi amwynderau neu ymyrryd â defnydd cyfreithlon arall o’r môr.

Notes: Yng nghyd-destun y Protocol ar Fod yn Barod am Ddigwyddiadau Llygru gan Sylweddau Peryglus a Darniweidiol, Ymateb Iddynt a Chydweithredu mewn Perthynas â Hwy.

Last updated: 15 June 2023

Welsh: sylwedd polyfflworoalcyl

English: polyfluoroalkyl substance

Status B

Subject: Environment

Part of speech: Noun, Masculine, Singular

Plural: sylweddau polyfflworoalcyl

Last updated: 8 September 2025

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