Adjective: Not capable of catching fire and burning; not flammable. 1921, Charles Kenneth Leith, The Economic Aspect of Geology, page 124: The ash represents the more incombustible mineral matter, usually of the nature of clay or slate.1921, Charles Kenneth Leith, The Economic Aspect of Geology, page 124: The ash represents the more incombustible mineral matter, usually of the nature of clay or slate.
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