'Incombustible' definitions:

Definition of 'incombustible'

(from WordNet)
adjective
Not capable of igniting and burning [syn: noncombustible, incombustible] [ant: combustible]

Definition of 'Incombustible'

From: GCIDE
  • 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. [1913 Webster]
  • 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. [1913 Webster]