Dictionary
Bry•thon•ic
Pronunciation: (bri-thon'ik), [key]—
adj.
of or belonging to P-Celtic.
—
n.
P-Celtic, esp. that part either spoken in Britain, as Welsh and Cornish, or descended from the P-Celtic speech of Britain, as Breton.
Also,Britannic,Brittonic.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.