[pyoor-een, -in]
noun Chemistry, Biochemistry.
a white, crystalline compound, C 5 H 4 N 4 , from which is derived a group of compounds including uric acid, xanthine, and caffeine.
one of several purine derivatives, especially the bases adenine and guanine, which are fundamental constituents of nucleic acids.

1895–1900; < German Purin. See pure, uric, -ine2

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World English Dictionary
purine or purin (ˈpjʊəriːn, ˈpjʊərɪn)
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
[C19: from German Purin; see pure, uric,-ine²]
purin or purin
[C19: from German Purin; see pure, uric,-ine²]

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American Heritage
Medical Dictionary

purine pu·rine (pyur'ēn')

  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
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Science Dictionary
purine   (pyr'ēn')  Pronunciation Key 
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.
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Example sentences
Soybeans also contain moderate amounts of a natural substance called purine.
Purine-containing foods include dried beans, peas, and liver.
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