incombustible

[in-kuhm-buhs-tuh-buhl]
adjective
1.
not combustible; incapable of being burned; fireproof.
noun
2.
an incombustible substance.

Origin:
1425–75; late Middle English < Medieval Latin incombustibilis. See in-3, combustible

incombustibility, incombustibleness, noun
incombustibly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
incombustible (ˌɪnkəmˈbʌstəbəl)
 
adj
1.  not capable of being burnt; fireproof
 
n
2.  an incombustible object or material
 
incombusti'bility
 
n
 
incom'bustibleness
 
n
 
incom'bustibly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Methane is a relatively pure compound whereas coal contains a significant
  amount of incombustible ash.
It is a term used to describe six naturally occurring incombustible minerals.
Incombustible matter resulting from combustion that does not leave as fly ash.
They are incombustible and cannot be degraded or destroyed easily.
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