Celtic \Celt"ic\, a. [L. Celticus, Gr. ?. See Celt.]

Of or pertaining to the Celts; as, Celtic people, tribes, literature, tongue. [Written also Keltic.]

Source: Webster's Revised Unabridged Dictionary (1913)
 

Celtic \Celt"ic\, n. The language of the Celts.

Note: 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.

Source: Webster's Revised Unabridged Dictionary (1913)