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swellfish
noun
Any plectognath fish that dilates itself, such as the pufferfish.
Exact(1)
The puffer, which is also called swellfish, or blowfish, is any member of a group of about 90 species of fishes of the family Tetraodontidae, noted for their ability when disturbed to inflate themselves so greatly with air and water that they become globular in form.
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