fireproof

[fahyuhr-proof]
adjective
1.
resistant to destruction by fire.
2.
totally or almost totally unburnable.
verb (used with object)
3.
to make fireproof.

Origin:
1630–40; fire + -proof

nonfireproof, adjective
quasi-fireproof, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
fireproof (ˈfaɪəˌpruːf)
 
adj
1.  capable of resisting damage by fire
 
vb
2.  (tr) to make resistant to fire

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It is fireproof, chemically resistant, and doesn't conduct electricity.
Airtight fireproof bunkers are relatively easy to build and are literally dirt
  cheap.
But instead of having a walled-in garden, he has fireproof masonry walls
  throughout the garden.
Reinforced concrete is much tougher than gypsum, but it is not fireproof.
Synonyms
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