Xanthin (?), n. [Gr. xanqos 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]