fire·​proof | \ˈfī(-ə)r-ˌprüf \

Definition of fireproof 

(Entry 1 of 2)

: proof against or resistant to fire


fireproofed; fireproofing; fireproofs

Definition of fireproof (Entry 2 of 2)

transitive verb

: to make fireproof

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Synonyms & Antonyms for fireproof

Synonyms: Adjective

incombustible, noncombustible, nonflammable, noninflammable

Antonyms: Adjective

burnable, combustible, flammable, ignitable (also ignitible), inflammable

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Examples of fireproof in a Sentence


remember to store valuable papers in a fireproof box


The building was not fireproofed.

Recent Examples on the Web: Adjective

In addition to the fake grass, DowDuPont showed fireproof outfits and a Kevlar motorcycle body. James T. Areddy, WSJ, "U.S.-China Trade Tensions on Display at Shanghai Expo," 7 Nov. 2018 Made with refractory material like that found in faux fireplace logs, the spooky stoneware skulls are fireproof and lightweight. Taysha Murtaugh, Country Living, "These $30 Skull Logs Will Make Your Fireplace Extra Eerie for Halloween," 10 Oct. 2018 Plus, Southern Virginia in the middle of summer is HOT, and that's without wearing layers of fireproof nomex. Jonathan M. Gitlin, Ars Technica, "How a day driving high-downforce cars at VIR taught me I’m OK being slow," 11 Sep. 2018 Another tactic in the quest for the safer battery is to make the electrolytes themselves fireproof, though still liquid. Angela Chen, The Verge, "The best solution for making batteries safer might be the most boring one," 13 Aug. 2018 Aspen officials planned a fireproof display using drone lights in place of fireworks., "Wildfires keep growing in US West," 4 July 2018 Only use fireworks outdoors away from buildings on a flat, level, hard, fireproof surface that is free from debris. Sarah Brookbank,, "Fourth of July: Best tips to stay safe when using fireworks," 4 July 2018 Two smaller pistols — a Star 9 millimeter and Bersa Thunder 380 — were found in a fireproof safe, Michalak said. Becky Jacobs, Post-Tribune, "In footage shown at trial, police find woman's body on floor of Lake Station home days after she likely died," 25 Apr. 2018 James Long, a spokesman for the Fire Department, said Sunday that residents in a fireproof building, like Trump Tower, were safest inside their apartments rather than evacuating. John Leland And Luis Ferre-sadurni,, "Art collector, bon vivant dies in Trump Tower home he couldn’t sell," 9 Apr. 2018

Recent Examples on the Web: Verb

Additional legislation in Sacramento seeks to fireproof the state’s energy infrastructure. Kurtis Alexander,, "With wildfire season at hand, California on slightly safer footing this year," 17 June 2018 In the main living space, vaulted brick panels appear to float from the ceiling while steel beams that have been fireproofed add texture to the space. Lauren Ro, Curbed, "Moody apartment renovation is all about natural materials," 23 Apr. 2018 The couple returned home Monday evening, and tried to fireproof the property. Ian Lovett, WSJ, "Shifting Conditions, Poor Communications Complicate California Wildfires," 12 Oct. 2017 Scientists contend that if money were redirected from firefighting into projects like fireproofing homes, those communities could actually be made safer. Justin Gillis, The Seattle Times, "Let forest fires burn? A black-backed woodpecker would applaud," 11 Aug. 2017 This wouldn’t necessarily be bad advice if the building were fully fireproofed and adapted to ensure that fire doesn’t spread from floor to floor. Feargus O'sullivan, The Atlantic, "The Grenfell Tower Fire and London's Public-Housing Crisis," 14 June 2017 The government suggested fireproofing several buildings at the center where the festival is held. Jaime Yaya Barry, New York Times, "Fire Tears Through Senegal Religious Festival, Killing at Least 22," 13 Apr. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fireproof.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of fireproof


1610, in the meaning defined above


1841, in the meaning defined above

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Statistics for fireproof

Last Updated

17 Nov 2018

Look-up Popularity

Time Traveler for fireproof

The first known use of fireproof was in 1610

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More Definitions for fireproof



English Language Learners Definition of fireproof

 (Entry 1 of 2)

: not easily burned : not able to catch fire



English Language Learners Definition of fireproof (Entry 2 of 2)

: to make (something) safe from fire


fire·​proof | \ˈfīr-ˈprüf \

Kids Definition of fireproof

: not easily burned : made safe against fire

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Comments on fireproof

What made you want to look up fireproof? Please tell us where you read or heard it (including the quote, if possible).


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