Pronunciation: (pyoor'ēn, -in),
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[key] —n.Chem.,Biochem. 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.