xanthine

[ zan-theen, -thin ]

/ ˈzæn θin, -θɪn /

noun Biochemistry, Chemistry.

a crystalline, nitrogenous compound, C5H4N4O2, related to uric acid, occurring in urine, blood, and certain animal and vegetable tissues.

any derivative of this compound.

Origin of xanthine

From French, dating back to 1855–60; see origin at xantho-, -ine²

Words nearby xanthine

xanthene dye, Xanthian, xanthic, xanthic acid, xanthin, xanthine, xanthinuria, Xanthippe, xanthism, xantho-, xanthochroid

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for xanthine

The artificial preparation of theobromine and caffeine from xanthine, and guanine also show clearly their relations.
Scientific American Supplement, No. 415, December 15, 1883|Various
It comprises the xanthine group and the uric acid group of bodies.
The Chemistry of Food and Nutrition|A. W. Duncan

British Dictionary definitions for xanthine

xanthine

/ (ˈzænθiːn, -θaɪn) /

noun

a crystalline compound related in structure to uric acid and found in urine, blood, certain plants, and certain animal tissues. Formula: C 5 H 4 N 4 O 2

any substituted derivative of xanthine, esp one of the three pharmacologically active methylated xanthines, caffeine, theophylline, or theobromine, which act as stimulants and diuretics

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for xanthine

xanthine

[ zăn′thēn′, -thĭn ]

n.

A yellowish-white crystalline purine base that is a precursor of uric acid and is found in blood, urine, and muscle tissue.

Any of several derivatives of this compound.

Scientific definitions for xanthine

xanthine

[ zăn′thēn′, -thĭn ]

Any of various purines having two oxygen atoms attached to the six-member ring of carbon and nitrogen atoms. Xanthines include caffeine, theophylline (a toxic alkaloid found in tea leaves), and theobromine (a toxic alkaloid found in cocoa).

The simplest of this class of compounds, forming yellowish-white crystals. It is produced in the body as an intermediate stage in the breakdown of purines to uric acid. It is also found in blood and in certain plants. Chemical formula: C5H4N4O2.

Any of several derivatives of this compound.

单词	xanthine
释义	xanthine [ zan-theen, -thin ] / ˈzæn θin, -θɪn / noun Biochemistry, Chemistry. a crystalline, nitrogenous compound, C5H4N4O2, related to uric acid, occurring in urine, blood, and certain animal and vegetable tissues. any derivative of this compound. Origin of xanthine From French, dating back to 1855–60; see origin at xantho-, -ine² Words nearby xanthine xanthene dye, Xanthian, xanthic, xanthic acid, xanthin, xanthine, xanthinuria, Xanthippe, xanthism, xantho-, xanthochroid Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for xanthine The artificial preparation of theobromine and caffeine from xanthine, and guanine also show clearly their relations. Scientific American Supplement, No. 415, December 15, 1883\|Various It comprises the xanthine group and the uric acid group of bodies. The Chemistry of Food and Nutrition\|A. W. Duncan British Dictionary definitions for xanthine xanthine / (ˈzænθiːn, -θaɪn) / noun a crystalline compound related in structure to uric acid and found in urine, blood, certain plants, and certain animal tissues. Formula: C 5 H 4 N 4 O 2 any substituted derivative of xanthine, esp one of the three pharmacologically active methylated xanthines, caffeine, theophylline, or theobromine, which act as stimulants and diuretics Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for xanthine xanthine [ zăn′thēn′, -thĭn ] n. A yellowish-white crystalline purine base that is a precursor of uric acid and is found in blood, urine, and muscle tissue. Any of several derivatives of this compound. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for xanthine xanthine [ zăn′thēn′, -thĭn ] Any of various purines having two oxygen atoms attached to the six-member ring of carbon and nitrogen atoms. Xanthines include caffeine, theophylline (a toxic alkaloid found in tea leaves), and theobromine (a toxic alkaloid found in cocoa). The simplest of this class of compounds, forming yellowish-white crystals. It is produced in the body as an intermediate stage in the breakdown of purines to uric acid. It is also found in blood and in certain plants. Chemical formula: C5H4N4O2. Any of several derivatives of this compound. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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