fireproofing

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fire·proof

 (fīr′pro͞of′)
adj.
Impervious or resistant to damage by fire.
tr.v. fire·proofed, fire·proof·ing, fire·proofs
To make fireproof.

fire•proof•ing

(ˈfaɪərˌpru fɪŋ)

n.
1. the act or process of rendering fireproof.
2. material for use in making anything fireproof.
[1865–70]