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comparative more Brittonic, superlative most Brittonic
Brythonic; pertaining to the Celtic people inhabiting Britain before the Roman conquest, and to their language. quotations examples
The Welsh language is not a backwards, insignificant thing; it is a fundamental part of Britain’s collective history. I find it absurd that so few English people realise it is still spoken in families and communities across Wales, as part of a Brittonic culture which has survived through the ages.
2014 July 23, Ellie Mae O'Hagen, The Guardian
The group of P-Celtic languages. examples