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From The Collaborative International Dictionary of English v.0.48:
Xanthin \Xan"thin\, n. [Gr. xanqo`s yellow.] 1. same as xanthine. [1913 Webster] 2. (Chem.) A yellow insoluble coloring matter extracted from yellow flowers; specifically, the coloring matter of madder. [Formerly written also xanthein.] [1913 Webster] 3. (Chem.) One of the gaseous or volatile decomposition products of the xanthates, and probably identical with carbon disulphide. [Obs.] [1913 Webster] Xanthine