English
heat-proof
From heat + -proof.
Formed from heat + -proof
Proto-Indo-European *keHy- ‘heat’
Proto-Germanic *haitį̄
Proto-West Germanic *haitī
Old English hǣtu
Middle English hete ‘heat’
English heat
Today it means
adj Unable to be affected or damaged by heat.
Language periods are conventional ranges, not dates for this word.
Etymograph / heat-proof