The Collaborative International Dictionary
Violantin
Violantin \Vi`o*lan"tin\, n. [See Violuric.] (Chem.) A complex nitrogenous substance, produced as a yellow crystalline substance, and regarded as a complex derivative of barbituric acid.
Wiktionary
violantin
n. (context chemistry archaic English) A complex nitrogenous substance derived from barbituric acid.