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xanthin n. 黄色色素 黄色色素 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
Xanthine \ Xan" thine\, n. Also Xanthin \ Xan" thin\ . [ 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.]
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