fireproof

From fire + -proof.

• Audio (Southern England):

  (file)

fireproof (comparative more fireproof, superlative most fireproof)

1. Resistant to damage from fire.

   Synonyms: fire-resistant, flame-retardant, refractory

   The fireproof safe will protect documents inside for up to four hours in a standard house fire.

   • 1914, Ernest Bramah, Max Carrados:

     When I was in the States, three years ago, the head porter at one hotel took pains to impress on me that the building was absolutely fireproof.

• fire-proof

fireproof (third-person singular simple present fireproofs, present participle fireproofing, simple past and past participle fireproofed)

1. To make resistant to damage from fire.

   I hastily fireproofed my clothing somewhat by pouring a bucket of water over myself before dashing into the flames.

• fireproof on Wikipedia.Wikipedia
• firebreak