TRUNKFISH
boxfish, trunkfish
(noun) any of numerous small tropical fishes having body and head encased in bony plates
Source: WordNet® 3.1
Etymology
Noun
trunkfish (plural trunkfishes or trunkfish)
Species of genera Lactophrys and Rhinesomus (in boxfish family Ostraciidae).
Source: Wiktionary
Trunk"fish`, n. (Zoöl.)
Definition: Any one of several species of plectognath fishes, belonging to
the genus Ostracion, or the family Ostraciontidæ, having an angular
body covered with a rigid integument consisting of bony scales. Some
of the species are called also coffer fish, and boxfish.
Source: Webster’s Unabridged Dictionary 1913 Edition