Etymology
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fireproof (adj.)

also fire-proof, 1630s, from fire (n.) + proof. As a verb, from 1867. Related: Fireproofed; fireproofing.

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Definitions of fireproof
1
fireproof (v.)
make resistant to fire;
2
fireproof (adj.)
impervious to damage by fire;
From wordnet.princeton.edu