Definition of Brythonic adjective from the Oxford Advanced Learner's Dictionary

 

Brythonic

 adjective
adjective
BrE BrE//brɪˈθɒnɪk//
 
; NAmE NAmE//brɪˈθɑːnɪk//
 
(also Brittonic)
 
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relating to the southern group of Celtic languages, including Welsh, Cornish and Breton compare Goidelic Word Originfrom Welsh Brython ‘Britons’ + -ic.
See the Oxford Advanced American Dictionary entry: Brythonic