Tetrodon
Tetrodon , noun
[Tetra- + Greek {not transcribed}, {not transcribed}, tooth.]
(Zoology) 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 (a), and similar species.