The Collaborative International Dictionary
acetyl-acrylic acid
Tetrinic \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.