a Celtic term, denoting a hill or eminence, and which often concurs to form the names of towns, to signify their high situation, places of strength or citadels; hills or eminences being adapted to such structures. See DUN.

(Ptolemy), a town of Ireland; now thought to be Down or Down-Patrick, in the county of Down. W. Long. 5° 57'. N. Lat. 54° 23'.