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From The Collaborative International Dictionary of English v.0.48:
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]