Brythonic

 
Pronunciation: /brɪˈθɒnɪk/
(also Brittonic)

adjective

  • denoting or relating to the southern group of Celtic languages, consisting of Welsh, Cornish, and Breton. They were spoken in Britain before and during the Roman occupation, surviving as Welsh and Cornish after the Anglo-Saxon invasions, and being taken to Brittany by emigrants. Compare with Goidelic.Also called P-Celtic.

noun

[mass noun]
  • the Brythonic languages collectively.

Origin:

from Welsh Brython 'Britons' + -ic