Definition of Brythonic adjective from the Oxford Advanced American Dictionary

 

Brythonic

 adjective
adjective
NAmE//brɪˈθɑnɪk//
 
(also Brittonic)
 
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relating to the southern group of Celtic languages, including Welsh, Cornish, and Breton compare Goidelic
See the Oxford Advanced Learner's Dictionary entry: Brythonic