cowfish

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A boxfish of warm coastal waters having hornlike protrusions or spines on the head.

from The Century Dictionary.

• noun A name applied in New England to the grampus, Grampus griseus.
• noun A name applied in Demerara to the manatee.
• noun A name of various fishes and other marine animals. A sea-cow or sirenian.
• noun A dolphin or porpoise. The Tursiops gilli, a porpoise of the family Delphinidæ, of the western coast of the United States. The grampus, Globicephalus melas.
• noun An ostraciontoid fish, Ostracion quadricorne, with strong antrorse supraocular spines, like horns, common in tropical Atlantic waters, and occasionally found along the southern coast of the United States. Also called cuckold.
• noun A local name in Orkney of sundry oval bivalve shell-fish, as clams.

from the GNU version of the Collaborative International Dictionary of English.

• noun The grampus.
• noun A California dolphin (Tursiops Gillii).
• noun A marine plectognath fish (Ostracoin quadricorne, and allied species), having two projections, like horns, in front; -- called also cuckold, coffer fish, trunkfish.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of various types of boxfish.
• noun The grampus.
• noun A California dolphin (Tursiops gillii).
• noun A marine plectognath fish (Ostracoin quadricorne and allied species), having two projections, like horns, in front; the cuckold, coffer fish, or trunkfish.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun trunkfish having hornlike spines over the eyes