Terms and Dictionary Resources Online Dictionaries: Geiriadur yr Academi Geiriadur Prifysgol Cymru Geiriadur Prifysgol Cymru y Drindod Dewi Sant Terms: Y Porth Termau Cenedlaethol Y Termiadur Addysg Termau’r Coleg Cymraeg Cenedlaethol BydTermCymru Corpws Cyfochrog y Cynulliad 'Cysgeir' Video Tutorials Introducing the main features of Cysgeir How Cysgeir deals with mutations and verbs Choosing words wisely - the Cysgeir disambiguator Singular and plural in Cysgeir Grammatical gender of nouns in Cysgeir Using Cysgeir in Word and Outlook