flammable

adjective

flam·​ma·​ble ˈfla-mə-bəl How to pronounce flammable (audio)
: capable of being easily ignited and of burning quickly
flammable noun

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Why Inflammable Is Not the Opposite of Flammable

Combustible and incombustible are opposites but flammable and inflammable are synonyms. Why? The in- of incombustible is a common prefix meaning "not," but the in- of inflammable is a different prefix. Inflammable comes from Latin inflammare ("to inflame"), itself from in- (here meaning "in" or "into") plus flammare ("to flame"). Flammable also comes from flammare. In the early 20th century, firefighters worried that people might think inflammable meant "not able to catch fire," so they adopted flammable and nonflammable as official safety labels and encouraged their use to prevent confusion. In general use, flammable is now the preferred term for describing things that can catch fire, but inflammable is still occasionally used with that meaning as well.

Examples of flammable in a Sentence

avoid wearing loose flammable clothing when using the blowtorch
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Listen to this article Newport Beach is using a nearly $450,000 grant to jumpstart the clearing of flammable vegetation in its Buck Gully Reserve and get homeowners nearby on board with creating defensible space around their homes to prevent wildfires. Erika I. Ritchie, Orange County Register, 27 Feb. 2025 Remove any flammable material — including mulch, flammable plants, leaves and needles, firewood piles, patio furniture — away from wall exteriors. Karen Garcia, Los Angeles Times, 27 Feb. 2025 Apparently, some of the flammable material got under the slide bar of the compactor, spreading the fire further into the truck. Ars Technica, 20 Feb. 2025 The fires were a bonfire of bad ideas that had piled up over decades, from suburban sprawl into wildfire zones to the flammable plastics that now fill many people’s homes. Jeff Goodell, Rolling Stone, 13 Feb. 2025 See All Example Sentences for flammable

Word History

Etymology

Latin flammare to flame, set on fire, from flamma

First Known Use

1813, in the meaning defined above

Time Traveler
The first known use of flammable was in 1813

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Cite this Entry

“Flammable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flammable. Accessed 12 Mar. 2025.

Kids Definition

flammable

adjective
flam·​ma·​ble ˈflam-ə-bəl How to pronounce flammable (audio)
: capable of being easily set on fire and of burning rapidly
a flammable liquid
flammability
ˌflam-ə-ˈbil-ət-ē
noun
flammable noun

More from Merriam-Webster on flammable

Last Updated: - Updated example sentences
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