n. [ Tetra- + Gr. &unr_;, &unr_;, 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 ]
☞ 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 ]
n. [ Tetra- + benzol. ] (Chem.) A hypothetical hydrocarbon, C4H4, analogous to benzene; -- so called from the four carbon atoms in the molecule. [ 1913 Webster ]
a. (Chem.) Of, pertaining to, or designating, an acid, C3H3.CO2H, of the acetylene series, homologous with propiolic acid, obtained as a white crystalline substance. [ 1913 Webster ]
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