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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.