Geiriadur Bangor (The Bangor Dictionary), launched in 2014, is a searchable online bilingual bidirectional Welsh/English dictionary which replaced the BBC’s retired Welsh/English Learn Welsh Dictionary  which had been primarily aimed at learners of Welsh as a second language.

It combines a general language dictionary, Cysgair2 (2004) and Y Termiadur Addysg (Terminology Dictionary for Education) (Prys and Prys 2011), the standardized terminology dictionary developed for bilingual primary, secondary and further education in Wales. The dictionary entries include the source language headword, a disambiguating part of speech (to differentiate between the noun and verbs in English that share the same word form), concept disambiguation text (to differentiate between concepts that share the same word form), as well as the equivalent word form(s) in the target language, their parts of speech and their plural forms.