heatproof

or heat-proof

[ heet-proof ]
/ ˈhitˌpruf /

adjective

not affected or damaged by heat, especially when placed in an oven or over a direct flame: heatproof cookware.

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Origin of heatproof

First recorded in 1905–10; heat + -proof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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