Simple Definition of fireproof

from our Learner's Dictionary

fireproof

1 of 2

adjective

ˈfajɚˌpruːf

: not easily burned : not able to catch fire

firefighters in fireproof suits

fireproof

2 of 2

verb

fireproofs; fireproofed; fireproofing

: to make (something) safe from fire

The building was not fireproofed.

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“Fireproof.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/fireproof. Accessed 17 Apr. 2026.

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