Dictionary![]() ![]() pyr•i•dinePronunciation: (pir'i-dēn", -din), [key] —n. Chem. a colorless, flammable, liquid organic base, C5H5N, having a disagreeable odor, usually obtained from coal or synthesized from acetaldehyde and ammonia: used chiefly as a solvent and in organic synthesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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