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Welcome to Geiriadur Prifysgol Cymru

GPC is the only standard historical dictionary of the Welsh language.

It is broadly comparable in method and scope to the Oxford English Dictionary.

It presents the vocabulary of the Welsh language from the earliest Old Welsh texts, through the abundant literature of the Medieval and Modern periods, to the huge expansion in
vocabulary resulting from the wider use of Welsh in all aspects of life in the last half century.

This vocabulary is defined in Welsh, and English equivalents are also given. Detailed attention is given to variant forms, collocations, and etymology.

The work is based on an ever-expanding collection of over two million citation slips gathered from a range of texts over many years.


GPC website and online dictionary access

Over recent weeks our website, online dictionary, and apps have been the victim of sporadic ‘denial of service attacks’ that have significantly slowed response times to users queries.

We are acutely aware of the frustration this causes our visitors and would like to apologize for any inconvenience caused.

We are working on identifying and preventing these attacks and generally improving security to reduce the likelihood of further incidents.


Android and iOS app update

Great news – Another momentous Dictionary milestone + 400 new words

Our new Android and iOS apps are now available for download.

Featuring the richness and wealth of knowledge our users have come to expect from GPC our new app allows you to take the dictionary with you wherever you go.

The launch of the app coincides with the addition of 400 new entries to the dictionary making this a double celebration.

With the added option to download the dictionary database to your phone or tablet you can enjoy the power of GPC even when you don’t have an internet connection.

Click here for download links and more information.

You can use the App Support page (Nav bar on right) to submit any queries you may have regarding the app and to view the app user guide and answers to common questions.

Click here for more information about the app launch.


Launch of the GPC apps


Information for Coleg Cymraeg Staff and Students


For today’s Word Of The Day selection from the dictionary click the link below –
GPC word of the day
And, to search for a word using the full online dictionary click –
GPC online

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