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