doctorfish

[ dok-ter-fish ]
/ ˈdɒk tərˌfɪʃ /

noun, plural doc·tor·fish·es, (especially collectively) doc·tor·fish.

a surgeonfish, especially Acanthurus chirurgus, of the West Indies, having a bluish body and black tail.

Origin of doctorfish

First recorded in 1825–35; so named from the knifelike rays on its tail