flammable
adjective
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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
Andrew Sheeler, Sacramento Bee, 20 Feb. 2025
You’re reminded that human beings are extremely flammable.
—David Fear, Rolling Stone, 20 Feb. 2025
Officials are also debating possible new homebuilding regulations, including rezoning for lower housing density in especially fire-prone areas, and expediting a set of forthcoming standards for removing debris, flammable vegetation and wooden fences from the perimeters of homes.
—Monica Hunter-Hart, Forbes, 16 Feb. 2025
There was talk a couple of years ago about UCSD cutting down the very flammable eucalyptus trees and replacing them with more fire-retardant vegetation.
—U T Readers, San Diego Union-Tribune, 31 Jan. 2025
See All Example Sentences for flammable
Cite this Entry
“Flammable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flammable. Accessed 1 Mar. 2025.
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flammable
adjective
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