in·com·bus·ti·ble

[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

in·com·bus·ti·bil·i·ty, in·com·bus·ti·ble·ness, noun
in·com·bus·ti·bly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
incombustible (ˌɪnkəmˈbʌstəbəl) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Incombustible is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a chattering or flighty, light-headed person.
Example sentences
Heaters shall always be placed and used on firm, level and stable incombustible
  surfaces.
They are incombustible and cannot be degraded or destroyed easily.
Methane is a relatively pure compound whereas coal contains a significant
  amount of incombustible ash.
The remainder of the storage should be confined to incombustible areas.
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