purine(redirected from A purine)
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1. A double-ringed, crystalline organic base, C5H4N4, that is the parent compound of a large group of biologically important compounds.
2. 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.
[German Purin : blend of Latin pūrus, clean; see pure, and New Latin ūricus, uric (from Greek ouron, urine) + -in, -in, -ine.]
1. (Elements & Compounds) a colourless crystalline solid that can be prepared from uric acid. Formula: C5H4N4
2. (Elements & Compounds) 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]
pu•rine(ˈpyʊər in, -ɪn)
1. a white, crystalline compound, C5H4N4, from which is derived a group of compounds including uric acid, xanthine, and caffeine.
2. one of several purine derivatives, esp. the bases adenine and guanine, which are fundamental constituents of nucleic acids.
Any of a group of organic compounds containing two rings of alternating carbon and nitrogen atoms. Purines include caffeine and uric acid, as well as the two bases adenine and guanine, which are components of DNA and RNA.
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|Noun||1.||purine - any of several bases that are derivatives of purine|
alkali, base - any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water; "bases include oxides and hydroxides of metals and ammonia"
adenine, A - (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
|2.||purine - a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances|