porcupine-fish

porcupinefish

[pawr-kyuh-pahyn-fish]
noun, plural (especially collectively) porcupinefish (especially referring to two or more kinds or species) porcupinefishes.
any of several fishes of the family Diodontidae, especially Diodon hystrix, of tropical seas, capable of inflating the body with water or air until it resembles a globe, with erection of the long spines covering the skin.

Origin:
1675–85; porcupine + fish

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
porcupinefish

noun
spines become erect when the body is inflated; worldwide in warm waters 
WordNet® 3.0, © 2006 by Princeton University.
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