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Definition of porcupine fish - 2 dictionary results
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porcupine fish  
n.  Any of various tropical marine fishes of the family Diodontidae, having strong sharp spines on the body and capable of inflating themselves when attacked.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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porcupine fish

any of the spiny, shallow-water fishes of the family Diodontidae, found in seas around the world, especially the species Diodon hystrix. They are related to the puffers and, like them, can inflate their bodies when provoked.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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