Celtiberian \Celt`i*be"ri*an\, a. [L. Celtiber, Celtibericus.] Of or pertaining to the ancient Celtiberia (a district in Spain lying between the Ebro and the Tagus) or its inhabitants the Celtiberi (Celts of the river Iberus). -- n. An inhabitant of Celtiberia. [1913 Webster]