/ Dictionary / Index P pyridine: Meaning and Definition of Find definitions for: pyr•i•dine Pronunciation: (pir'i-dēn", -din), [key] — n. Chem. a colorless, flammable, liquid organic base, CHN, 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. See also: pyridine (Thesaurus) Pyribenzamine Pyridium Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language