Uncountable noun referring collectively to the Brythonic languages.
Brythonic diverged into Welsh, Cornish, and Breton over the centuries.
Le brittonique s'est divisé en gallois, cornique et breton au fil des siècles.
Describes anything related to the Brythonic branch of Celtic languages.
Welsh and Cornish are Brythonic languages.
Le gallois et le cornique sont des langues brittoniques.