filefish

[ fahyl-fish ]
/ ˈfaɪlˌfɪʃ /

noun, plural (especially collectively) file·fish, (especially referring to two or more kinds or species) file·fish·es.

any of several flattened marine fishes of the family Monacanthidae, having an elongated head with a small mouth and small, spiny scales.
a triggerfish.

Origin of filefish

First recorded in 1765–75; file2 + fish

British Dictionary definitions for filefish

filefish
/ (ˈfaɪlˌfɪʃ) /

noun plural -fish or -fishes

any tropical triggerfish, such as Alutera scripta, having a narrow compressed body and a very long dorsal spine

Word Origin for filefish

C18: referring to its file-like scales