Incombustible

Pronunciation

Origin

From - + combust + -.

Full definition of incombustible

Adjective

1. Not capable of catching fire and burning; not flammable.
• 1921, Charles Kenneth Leith, The Economic Aspect of Geology‎, The ash represents the more incombustible mineral matter, usually of the nature of clay or slate.

Antonyms

• (not flammable) combustible, flammable US, inflammable UK

Noun

1. Any substance that is not flammable.----