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xanthine

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xan⋅thine

  [zan-theen, -thin]
Use xanthine in a Sentence
–noun Biochemistry, Chemistry.
1. a crystalline, nitrogenous compound, C5H4N4O2, related to uric acid, occurring in urine, blood, and certain animal and vegetable tissues.
2. any derivative of this compound.
Origin:
1855–60; < F; see xantho-, -ine 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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xan·thine   (zān'thēn', -thĭn)   
n.  

  1. A yellowish-white, crystalline purine base, C5H4N4O2, that is a precursor of uric acid and is found in blood, urine, muscle tissue, and certain plants.

  2. Any of several derivatives of this compound.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: xan·thine
Pronunciation: 'zan-"thEn
Function: noun
: a feebly basic compound C5H4N4O2 thatoccurs especially in animal or plant tissue, is derived from guanine and hypoxanthine, and yields uric acid on oxidation; also : any of various derivatives of this
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

xanthine xan·thine (zān'thēn', -thĭn)
n.

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

  2. 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.
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Science Dictionary
xanthine   (zān'thēn', -thĭn)  Pronunciation Key 

  1. 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).

  2. 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.

  3. Any of several derivatives of this compound.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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