flameproof

From Wiktionary

Word parts[change]

flame + -proof

Adjective[change]

Positive
flameproof

Comparative
more flameproof

Superlative
most flameproof

  1. If something is flameproof, it is not flammable.

Verb[change]

Plain form
flameproof

Third-person singular
flameproofs

Past tense
flameproofed

Past participle
flameproofed

Present participle
flameproofing

  1. If you flameproof something, you make it flameproof.