Noncombustible

the GNU version of the Collaborative International Dictionary of English
  • adjective. Not combustible; not able to burn. Opposite of combustible.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • adjective. That will not readily ignite and burn
  • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • adjective. not capable of igniting and burning
  • Word Usage
    "MSHA official Kevin Stricklin said that, of 1,800 rock-dust samples collected from the Upper Big Branch mine, the noncombustible content in 79% of the samples was too low."
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