fireproof

From Wiktionary

Word parts[change]

fire + -proof

Adjective[change]

Positive
fireproof

Comparative
more fireproof

Superlative
most fireproof

  1. If something is fireproof, it is resistant to fire.

Verb[change]

Plain form
fireproof

Third-person singular
fireproofs

Past tense
fireproofed

Past participle
fireproofed

Present participle
fireproofing

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