Incombustible definition

ĭnkəm-bŭstə-bəl
An incombustible substance.
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adjective
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Incapable of burning.
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An incombustible object or material.
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Not combustible; that cannot be burned; fireproof.
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Any substance that is not flammable.
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Origin of incombustible

  • From in- +‎ combust +‎ -ible.

    From Wiktionary