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 ]
{ n. Also }. [ Gr. xanqo`s yellow. ] (Physiol. Chem.) A type of purine obtainable as a white microcrystalline powder, C5H4O2N4, present in muscle tissue, in the liver, spleen, pancreas, and other organs, and also in urine (in small quantities) and some urinary calculi, and in the juices of certain plants; -- so called because it leaves a yellow residue when evaporated to dryness with nitric acid. It is also present in guano. Xanthine is closely related to uric acid. [ Webster 1913 Suppl. ]
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 ]
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