globefish

n., pl., globefish, or -fish·es.
Any of various fishes, especially the ocean sunfish or puffer, having or capable of assuming a globular shape.

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The noun has one meaning:

Meaning #1: any of numerous marine fishes whose elongated spiny body can inflate itself with water or air to form a globe; several species contain a potent nerve poison; closely related to spiny puffers
  Synonyms: puffer, blowfish

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