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xanthines
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2 dictionary results for: xanthines
American Heritage Dictionary - Cite This Source - Share This
xan·thine     (zān'thēn', -thĭn)  Pronunciation Key 
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 © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
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The American Heritage Science Dictionary - Cite This Source - Share This
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 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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