• Webster's Revised Unabridged Dictionary
    • n Tetrodon (Zoöl) Any one of numerous species of plectognath fishes belonging to Tetrodon and allied genera. Each jaw is furnished with two large, thick, beaklike, bony teeth.☞ The skin is usually spinous, and the belly is capable of being greatly distended by air or water. It includes the swellfish, puffer , and similar species.
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Century Dictionary and Cyclopedia
    • n tetrodon A genus of plectognath fishes, typical of the family Tetrodontidæ. The species are numerous in warm seas. T. turgidus is an abundant blower, pupper, or swell-toad of the Atlantic coast of the United States, attaining a foot in length. See cut under balloon-fish.
    • n tetrodon [lowercase] A fish of this genus or of the family Tetrodontidæ.
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Webster's Revised Unabridged Dictionary
Tetra-, + Gr. , , tooth