Online Welsh Dictionaries



Geiriadur Prifysgol Cymru : A Dictionary of the Welsh
The major Standard historical dictionary of Welsh which was prepared by the University of Wales between 1921 and 2002. A second edition is in preparation and the whole of both editions is available online at where it is possible to search for Welsh and English words and phrases.

The Welsh Academy English-Welsh
The main English-Welsh dictionary which was prepared by Bruce Griffiths and Dafydd Glyn Jones. You will need to scroll to the bottom of the page ‘Terms of use’ and click on the button ‘Accept’ in order to use this dictionary.

UWTSD’s Welsh
An extensive searchable Welsh and English glossary which was prepared by the University of Wales Trinity Saint David Welsh Department at Lampeter.

Bangor University Welsh Dictionary
A Welsh-English/English-Welsh dictionary prepared by Canolfan Bedwyr. It is especially useful for learners. It gives links to other dictionaries and technical terminology resources. (This is the dictionary that was originally on the BBC website.)

A dictionary prepared by D. Geraint Lewis and Nudd Lewis which is in a beta version. You have to register to use it but it is currently free to use.

Geiriadur Rwsieg-Cymraeg/
A Welsh-Russian/Russian-Welsh dictionary which was prepared by Dmitri Hrapof of Moscow.

Technical terms

Y Porth Termau Cenedlaethol : The National Terminology Portal –
A database of terms prepared by Bangor University’s Terminology and Language Technology Unit. It also provides links to a number of similar resources.
This is a bank of terms used by Welsh Government translators in their everyday work. It is continually updated with a view to providing an increasingly comprehensive database of terminology which is standardised and which reflects current usage in the various fields of the Government’s operation. It also includes the names of Welsh Government initiatives and programmes, and the titles of many documents published by the Welsh Government and other bodies. It is published on the internet as a useful tool for bilingual working beyond the translation profession.

Coleg Cymraeg Cenedlaethol : Terms for Higher Education
A database of terms for Higher Education.

Welsh place-names

Enwau Cymru : Welsh
A dictionary listing the spellings for Welsh place-names as standardized by the Welsh Language Commission panel, which includes some Geiriadur Prifysgol Cymru staff.


European Dictionary
The European Dictionary Portal, curated by experts in the European Network of e-Lexicography, is a guide to good online dictionaries of European languages regardless of whether you are an academic, a translator, a language teacher or simply a language enthusiast.

This page is maintained by the staff of Geiriadur Prifysgol Cymru. Corrections and additions are welcome.

See further contact details here.

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