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balloonfish

[buh-loon-fish]
noun, plural bal·loon·fish·es, (especially collectively) bal·loon·fish.
  1. a porcupinefish, Diodon holacanthus, inhabiting tropical and subtropical waters.
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Origin of balloonfish

First recorded in 1825–35; balloon + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018