combustible /kəmˈbʌstɪbəl/adjective 2noun 2forms 3 adjective2 •Capable of burning.Dumping fertilizer on top of whatever mysterious goop was in the storage tank created a combustible mix which caught fire. •(figurative, old-fashioned) Easily kindled or excited; quick; fiery; irascible.Arnold, however, was a combustible character. — 1855 noun2 •A material that is capable of burning.A wheel, wrapt in combustibles, was kindled and rolled down the hill. — 1890 •A cigarette or a similar product intended for smoking, as opposed to an electronic cigarette.In total three-quarters of the western Big Tobacco giants' sales last year came from so-called combustibles as vaping sales are plateauing. — 2025 formscombustibles · more combustible · most combustible