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.

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.