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a heterocyclic compound that is the nucleus of the purine bases such as adenine and guanine (which occur in DNA and RNA), and xanthine and hypoxanthine.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

pur·ine (Pur),

(pyūr'ēn, -rin),
The parent substance of adenine, guanine, and other naturally occurring purine "bases."
Farlex Partner Medical Dictionary © Farlex 2012


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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


The parent substance of adenine, guanine, and other naturally occurring so-called purine bases; not known to exist as such in mammals.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


one of two types of base found in NUCLEIC ACIDS, having a double ring structure; see ADENINE and GUANINE. Purines always pair with PYRIMIDINES in the two strands of DNA, ensuring a parallel-sided molecule.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


A white crystalline substance that is one of the building blocks of DNA. Uric acid is produced when purine is broken down in the body.
Mentioned in: Gout, Uric Acid Tests
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
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(2003), a PSRG-FE e considerada a fracao de glomalina localizada em sitios do solo que sao mais susceptiveis a producao e decomposicao recentes e, portanto, que exibem maiores variacoes de carater microambiental (PURIN, 2005).
Lou Purin emphasized, "We are able to utilize local suppliers and source all our materials from the Wilmington area.
Nine-year-old beagle Purin holds the record for the |most balls caught by a dog with her paws in one minute
Coronel Portillo, Puerto Purin 8[grados]44'59.2" [S]/ 74[grados]8'19.52"W 122m 17.vii.2008.
Purin holds the record for balls <Bcaught by a dog in one minute