Webster's Revised Unabridged Dictionary · 1913

Celtic

Celtic (selt"ik; kelt"ik) , adjective

[Latin Celticus, Greek Keltiko`s. See Celt.]

Of or pertaining to the Celts; as, Celtic people, tribes, literature, tongue.

Celtic , noun

The language of the Celts.

The remains of the old Celtic language are found in the Gaelic, the Erse or Irish; the Manx, and the Welsh and its cognate dialects Cornish and Bas Breton.