• Webster's Revised Unabridged Dictionary
    • Xanthin (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.
    • Xanthin (Chem) A yellow insoluble coloring matter extracted from yellow flowers; specifically, the coloring matter of madder.
    • Xanthin (Chem) One of the gaseous or volatile decomposition products of the xanthates, and probably identical with carbon disulphide.
    • Xanthin same as xanthine.
    • ***
Century Dictionary and Cyclopedia
    • n xanthin A simplified spelling of xanthine.
    • n xanthin One of several substances, so named with reference to their color. ( Especially— That part of the yellow coloring matter of flowers which is insoluble in water.
    • ***
Chambers's Twentieth Century Dictionary
    • n Xanthin zan′thin a name given to the yellow colouring matter of various flowers, to a principle in madder, and to a deposit of urine
    • ***


Webster's Revised Unabridged Dictionary
Gr. xanqo`s yellow
Chambers's Twentieth Century Dictionary
Gr. xanthos, yellow.


In literature:

The artificial preparation of theobromine and caffeine from xanthine, and guanine also show clearly their relations.
"Scientific American Supplement, No. 415, December 15, 1883" by Various
The xanthin group is almost without any excitatory action, and its metabolic end products are constant.
"All About Coffee" by William H. Ukers
Xanthin and catechol browns are pleasing in appearance, but their effect is less rich than that obtained with potash.
"The Decoration of Leather" by Georges de Récy