filefish > define
noun
- Narrow flattened warm-water fishes with leathery skin and a long file-like dorsal spine. .
by WordNet 3.0 © 2006 by Princeton University
(n.) Any plectognath fish of the genera Monacanthus, Alutera, balistes, and allied genera; -- so called on account of the roughly granulated skin, which is sometimes used in place of sandpaper.
by Webster's Revised Unabridged Dictionary