purine

Purine (1) is a heterocyclic aromatic organic compound, consisting of a pyrimidine ring fused to an imidazole ring. Purines make up one of the two groups of nitrogenous bases. Pyrimidines make up the other group. These bases make up a crucial part of both deoxyribonucleotides and ribonucleotides, and the basis for the universal genetic code.
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n. purine, double-ring compound found in nucleic acids, heterocyclic compound made up of pyrimidine and imidazole rings (Biochemistry)

n. purine, double-ring compound found in nucleic acids, heterocyclic compound made up of pyrimidine and imidazole rings (Biochemistry)

One of the two classes of bases in DNA and RNA. The purine bases are guanine (G) and adenine (A). Uric acid, the offending substance in gout, is a purine end-product.