- Xanthinine Xan"thi*nine, n. [Gr. xanqo`s yellow + quinine.] (Chem.) A complex nitrogenous substance related to urea and uric acid, produced as a white powder; -- so called because it forms yellow salts, and because its solution forms a blue fluorescence like quinine. [1913 Webster]
The Collaborative International Dictionary of English. 2000.