Webster's English Dictionary

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brythonic

1. Bry.thon.ic \'brith-(.)a:n-ik\ aj 1: of, relating to, or characteristic 
   of the Brythons  2: of, relating to, or characteristic of the Celtic 
   languages that include s Welsh, Cornish, and Breton
2. Brythonic n : the Brythonic branch of the Celtic languages