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flameproof

[fleym-proof]
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adjective
  1. resisting the effect of flames; not readily ignited or burned by flames.
verb (used with object)
  1. to make flameproof.

Origin of flameproof

First recorded in 1885–90; flame + -proof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for flameproof

flameproof

adjective
  1. not liable to catch fire or be damaged by fire
  2. (of electrical apparatus) designed so that an internal explosion will not ignite external flammable gas
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012