fire·​proof | \ ˈfī(-ə)r-ˌprüf How to pronounce fireproof (audio) \

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

Moon Use: After Apollo 1’s tragic fire that claimed the lives of three astronauts, NASA engineers redesigned the spacesuits to be fireproof. Matt Blitz, Popular Mechanics, "How Our Trip to the Moon Pushed Innovation Here on Earth," 23 July 2019 The writer mentioned dehydrated bacon cubes and turkey gravy stuffing tied in fireproof ribbon and warmed by a hot air gun. Nathan Mattise, Ars Technica, "Space and booze, an anecdotal history," 6 July 2019 One of the reasons the Butler was built was because its founder and namesake, Joseph Butler, sought a fireproof home for his work, and the museum continues to give consideration to lighting and climate control. Vince Guerrieri, Popular Mechanics, "The Secret Tech Problem at Modern Art Museums," 24 June 2019 The tunnel includes sprinklers, a fireproof mineral surface on roadway ceilings and ventilation fans to suck out smoke. Mike Lindblom, The Seattle Times, "What will the Highway 99 tunnel opening mean for bus routes, detours and tsunamis? We answer those questions and more," 12 Dec. 2018 Improving batteries takes three main tacks: avoiding flammable liquids for a solid battery; making battery components fireproof; and, boringly, modifying slightly the existing features in a battery. Angela Chen, The Verge, "The best solution for making batteries safer might be the most boring one," 13 Aug. 2018 Use fire-resistant plants (no plants are fireproof) and rock, or other hardscape, around the home. San Diego Union-Tribune, "Don’t let your landscaping become a fire risk," 7 June 2019 Companies looking to fireproof operations are turning to deals that add product lines, geographies or capabilities. Tatyana Shumsky, WSJ, "Companies Use Deals to Buy New Skills in Battle to Spur Growth," 23 Jan. 2019 Following the popularity of the fireproof logs, stores have started to carry the creepy decor—for a fraction of the previous price. Taysha Murtaugh, Country Living, "These $30 Skull Logs Will Make Your Fireplace Extra Eerie for Halloween," 10 Oct. 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

11 Aug 2019

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 How to pronounce fireproof (audio) \

Kids Definition of fireproof

: not easily burned : made safe against fire

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More from Merriam-Webster on fireproof

Rhyming Dictionary: Words that rhyme with fireproof

Thesaurus: All synonyms and antonyms for fireproof

Spanish Central: Translation of fireproof

Nglish: Translation of fireproof for Spanish Speakers

Comments on fireproof

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a wrong name or inappropriate designation

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