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purine

[pyoo r-een, -in] /ˈpyʊər in, -ɪn/
noun, Chemistry, Biochemistry
1.
a white, crystalline compound, C 5 H 4 N 4 , from which is derived a group of compounds including uric acid, xanthine, and caffeine.
2.
one of several purine derivatives, especially the bases adenine and guanine, which are fundamental constituents of nucleic acids.
Origin
1895-1900
1895-1900; < German Purin. See pure, uric, -ine2
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for purines

purine

/ˈpjʊəriːn/
noun
1.
a colourless crystalline solid that can be prepared from uric acid. Formula: C5H4N4
2.
Also called purine base. any of a number of nitrogenous bases, such as guanine and adenine, that are derivatives of purine and constituents of nucleic acids and certain coenzymes
Word Origin
C19: from German Purin; see pure, uric,-ine²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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purines in Medicine

purine pu·rine (pyur'ēn')
n.

  1. A colorless crystalline organic base that is the parent compound of various biologically important derivatives.

  2. Any of a group of organic compounds that are derived from or are structurally related to purine, including uric acid, caffeine, adenine, and guanine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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purines in Science
purine
  (pyr'ēn')   
Any of a group of organic compounds containing two fused rings of carbon and nitrogen atoms. One ring has six members, the other has five, and each has two nitrogens. Purines include a number of biologically important compounds, such as adenosine, caffeine, uric acid, and the two bases adenine and guanine, which are components of DNA and RNA.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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