Tetrinic

Te`trin´ic


a.1.(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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.