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Xanthin

Definition: A crystalline nitrogenous body closely related to both
uric acid and hypoxanthin, present in muscle tissue, and occasionally
found in the urine and in some urinary calculi. It is also present in
guano. So called from the yellow color of certain of its salts
(nitrates).

Xanthin

Definition: A yellow insoluble coloring matter extracted from yellow
flowers; specifically, the coloring matter of madder.

Xanthin

Definition: One of the gaseous or volatile decomposition products of
the xanthates, and probably identical with carbon disulphide.