The Collaborative International Dictionary
Incombustible \In`com*bus"ti*ble\, a. [Pref. in- not + combustible: cf. F. incombustible.] Not combustible; not capable of being burned, decomposed, or consumed by fire; uninflammable; as, asbestus is an incombustible substance; carbon dioxide is an incombustible gas.
Incombustible cloth, a tissue of amianthus or asbestus; also, a fabric imbued with an incombustible substance. -- In`com*bus"ti*ble*ness, n. -- In`com*bus"ti*bly, adv.
Douglas Harper's Etymology Dictionary
late 15c., from Old French incombustible (14c.) or directly from Medieval Latin incombustibilis; see in- (1) + combustible.
Wiktionary
a. Not capable of catching fire and burning; not flammable. n. Any substance that is not flammable.
WordNet
adj. not capable of igniting and burning [syn: noncombustible] [ant: combustible]
Usage examples of "incombustible".
But it perpetually adheres to the commixed or compound bodies, that is, the sol and luna, and communicates to them the living tincture, incombustible and most fixed, much more noble and precious than the former which these bodies had.