heat + -proof
heatproof (comparative more heatproof, superlative most heatproof)
- insulating and incombustible
- For safety always use bunsen burners on heatproof mats.
heatproof (third-person singular simple present heatproofs, present participle heatproofing, simple past and past participle heatproofed)
- (transitive) To make insulating and incombustible.