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From The Collaborative International Dictionary of English v.0.48:
Tetrodon \Tet"ro*don\, n. [Tetra- + Gr. ?, ?, tooth.] (Zool.) 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. [Written also tetradon.] [1913 Webster] Note: The skin is usually spinous, and the belly is capable of being greatly distended by air or water. It includes the swellfish, puffer (a), and similar species. [1913 Webster]