Liberal Dictionary English Dictionary
adjective
- not combustible; incapable of being burned; fireproof.
noun
- an incombustible substance.
adjective
- not capable of being burnt; fireproof
noun
- an incombustible object or material
late 15c., from Old French incombustible (14c.) or directly from Medieval Latin incombustibilis; see in- (1) + combustible.