flameproof

• flame-proof

From flame + -proof.

flameproof (comparative more flameproof, superlative most flameproof)

1. Resistant to catching fire.
   • 1952 December, “Brighton Line Resignalling, Southern Region”, in Railway Magazine, page 830:

     One hundred and fifty miles of flameproof wire have been used in the signalboxes and relay rooms.

• fireproof

flameproof (third-person singular simple present flameproofs, present participle flameproofing, simple past and past participle flameproofed)

1. (transitive) To make flameproof.
   • 1960 September, M. J. Wilson, “Harlow Town station opened”, in Trains Illustrated, page 542:

     Structural timber in the roofs throughout the station has been flameproofed.

• “flameproof”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.