a. Chem. [app. f. TRI- 5 b + Gr. γένος kind + -IC: the acid was so named by Liebig and Wöhler, 1846, regarding it as the product of three kinds of substances, cyanic acid, aldehyde, and ammonia.] In trigenic acid, NH:2(CO.NH):CH.CH3, also called ethylidene (or ethidene) biuret, as being biuret, NH:2(CO.NH2), in which two atoms of H are replaced by ethylidene, CH.CH3; it crystallizes in small prisms, slightly soluble in water.
1868. Watts, Dict. Chem., V. 883.
1882. Jrnl. Chem. Soc., XLII. 168.
