'Trunkfish' definitions:

Definition of 'trunkfish'

noun

Any of numerous small tropical fishes having body and head encased in bony plates [syn: boxfish, trunkfish]

From: GCIDE

Trunkfish \Trunk"fish`\, n. (Zool.) Any one of several species of plectognath fishes, belonging to the genus Ostracion, or the family Ostraciontidae, having an angular body covered with a rigid integument consisting of bony scales. Some of the species are called also coffer fish, and boxfish. [1913 Webster]

From: GCIDE

Cowfish \Cow"fish`\ (kou"f[i^]sh`), n. (Zool.) (a) The grampus. (b) A California dolphin (Tursiops Gillii). (c) A marine plectognath fish (Ostracoin quadricorne, and allied species), having two projections, like horns, in front; -- called also cuckold, coffer fish, trunkfish. [1913 Webster]