The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of various bright-colored tropical marine fishes of the family Acanthuridae, having one or more sharp erectile spines near the base of the tail.
n. Any of many brightly coloured fishes, of the family Acanthuridae, that have an erect spine near the tail
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. brightly colored coral-reef fish with knifelike spines at the tail
Word Usage
"Other important components of the fringing reef ecosystem include algae (brown, red and green), marine invertebrates (shrimp, lobster, crabs and sea urchins) and fishes (parrotfish, wrasses, damselfish, surgeonfish, goatfish, jacks and sharks)."