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