• Webster's Revised Unabridged Dictionary
    • n Swellfish (Zoöl) Any plectognath fish that dilates itself, as the bur fish, puffer, or diodon.
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Century Dictionary and Cyclopedia
    • n swellfish A plectognath fish, of any of the several genera Tetrodon, Diodon, and related forms, capable of inflating itself like a ball, or swelling up by swallowing air: the name is given to the globe-fish, bur-fish, puffing-fish, porcupine-fish, rabbit-fish, tambor, puffer, etc. Numerous species are found in the seas of most parts of the world. Also swell-toad. See also cuts under balloon-fish, Diodon, and Tetrodontidæ.
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