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Books about Cormaic:
Sanas Cormaic (Cormacs Glossary) by Cormac Ua Cuillenain and Kuno Meyer (Feb 1994)
Wiki information Cormaic:
Sanas Cormaic, also known as Cormac's Glossary, is an early Irish glossary containing etymologies and explanations of over 1,400 Irish words, many of which are difficult or outdated. The shortest and earliest version of the work is ascribed to Cormac...
Tecosca Cormaic "The Instructions of Cormac" is a ninth-century Old Irish gnomic text which is cast as a dialogue between the legendary High-King of Ireland, Cormac mac Airt, and his son Coirpre Lifechair.