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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