Tet"ro*don (?), n. [Tetra- + Gr. ?,
?, tooth.] (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. [Written
also tetradon.]
☞ 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.