/ Dictionary / Index C combustible: Meaning and Definition of Find definitions for: com•bus•ti•ble Pronunciation: (kum-bus'tu-bul), [key] — adj. capable of catching fire and burning; inflammable; flammable: Gasoline vapor is highly combustible. easily excited: a high-strung, combustible nature. —n. a combustible substance: Trucks carrying combustibles will not be allowed to use this tunnel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: combustible (Thesaurus) combust combustion Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language