from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A double-ringed, crystalline organic base, C5H4N4, 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.
- n. Any of a group of organic compounds structurally related to purine, particularly adenine and guanine, and also caffeine, uric acid, theobromine, and theophylline.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a class of organic heterocyclic base containing fused pyrimidine and imidazole rings; they are components of nucleic acids
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any of several bases that are derivatives of purine
- n. a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances
German Purin : blend of Latin pūrus, clean; see pure, and New Latin ūricus, uric (from Greek ouron, urine) + -in, -in, -ine.(American Heritage® Dictionary of the English Language, Fourth Edition)