Purine definition

pyo͝orēn
A double-ringed, crystalline organic base, C5 H4 N4 , not known to occur naturally, from which is derived the nitrogen bases adenine and guanine, as well as uric acid as a metabolic end product.
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Any of a group of organic compounds structurally related to purine, particularly adenine and guanine, and also caffeine, uric acid, theobromine, and theophylline.
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A colorless, crystalline organic compound, C5H4N4, the parent substance of the uric-acid group of compounds.
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Any of several basic substances produced by the decomposition of nucleoproteins and having a purine-type molecule, as caffeine, adenine, or guanine.
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A double-ringed, crystalline organic base, C5 H4 N4 , that is the parent compound of a large group of biologically important compounds.
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Any of a group of substituted derivatives of purine, including the nitrogen bases adenine and guanine, which are components of nucleic acids. Uric acid, caffeine, theobromine, and theophylline are also purines.
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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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(organic chemistry) Any of a class of organic heterocyclic compounds composed of fused pyrimidine and imidazole rings that comprise one of the two groups of organic nitrogenous bases (the other being the pyrimidines) and are components of nucleic acids.
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Other Word Forms

Noun

Singular:
purine
Plural:
purines

Origin of purine

  • German Purin blend of Latin pūrus clean pure and New Latin ūricus uric (from Greek ouron urine) -in -in, -ine

    From American Heritage Dictionary of the English Language, 5th Edition