Free (GPL) Dictionary (incorporating Konjugator and Rhymer)

Storfa aur, geirfa'r iaith

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How to use Rhymer

About Eurfa

I started work on Eurfa in 2003, and released the first version in 2006. It is the largest Welsh dictionary under a free license, and it was the first dictionary of a Celtic language to list verbal inflections and mutated forms.

This new edition benefits from the work done in using Eurfa in the Bangor Autoglosser, and includes simplifications of the database layout, corrections, and additions. In particular, mutated words are no longer listed in the database - they are detected on-the-fly, and the appropriate non-mutated word is returned. Eurfa includes, as before, an application to find rhyming words (Rhymer), and I have taken the opportunity to add new functionality by embedding Konjugator, a Welsh verb conjugator that I first released in 2005.

There are about 211,000 words in Eurfa, but the current number of lemmas is 10393:


I have consulted a number of sources for the information in Eurfa, and I am grateful to their authors. Any mistakes in the material presented here are my responsibility.

Geiriadur Mawr H Meurig Evans, WO Thomas Christopher Davies/Gwasg Gomer 1976
Guide to Correct Welsh Morgan D Jones Gomer Press 1976
Termiadur Ysgol Delyth Prys, J Prys Morgan Jones ACCAC 1978
Collins Spurrell Welsh Dictionary DA Thorne, HarperCollins 1991
Modern Welsh Gareth King Routledge 1993
Geiriadur yr Academi Bruce Griffiths, Dafydd Glyn Jones University of Wales Press 1995
Gramadeg y Gymraeg Peter Wynn Thomas University of Wales Press 1996
Y Llyfr Berfau D Geraint Lewis Gomer 2003
Y Treigladur D Geraint Lewis Gomer 2003
Gramadeg Cymraeg Cyfoes Uned Iaith Genedlaethol Cymru CBAC Gomer 2005
Y Termiadur Delyth Prys, J Prys Morgan Jones, Owain Davies, Gruffudd Prys ACCAC 2006
Y Golygiadur Rhiannon Ifans Cymdeithas Llyfrau Ceredigion 2006
Geiriadur Prifysgol Cymru various University of Wales Press ongoing