Te*trin"ic (?), a. [See Tetra-.] (Chem.) Of, pertaining to, or
designating, a complex ketonic acid, C5H6O3, obtained as a white
crystalline substance; — so called because once supposed to contain a
peculiar radical of four carbon atoms. Called also acetyl-acrylic acid.
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.
Tet"ro*dont (?), a. (Zoöl.) Of or pertaining to the tetrodons. — n. A
tetrodon. [Written also tetradont, and tetraodont.]
Tet"rol (?), n. [Tetra- + benzol.] (Chem.) A hypothetical hydrocarbon,
C4H4, analogous to benzene; — so called from the four carbon atoms in
the molecule.