Brittonic

[bri-ton-ik] /brɪˈtɒn ɪk/
adjective
1.
Origin
< Late Latin Brittōn(ēs) (see Briton) + -ic
British Dictionary definitions for Brittonic

Brittonic

/brɪˈtɒnɪk/
noun, adjective
1.
another word for Brythonic