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purine (n.)

basic crystalline substance found in uric acid, caffeine, adenine, etc., 1898, from German purin (Fischer), said to be from Latin purum, neuter of purus "clean, pure" (see pure) + Modern Latin uricum "uric acid" (see urine) + chemical suffix -ine (2). Related: Purinergic.

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Definitions of purine from WordNet

purine (n.)
any of several bases that are derivatives of purine;
purine (n.)
a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances;
From wordnet.princeton.edu