/ Dictionary / Index P propane: Meaning and Definition of Find definitions for: pro•pane Pronunciation: (prō'pān), [key] — n. Chem. a colorless, flammable gas, CH, of the alkane series, occurring in petroleum and natural gas: used chiefly as a fuel and in organic synthesis. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: propane (Thesaurus) propagule propanedioic Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language