Origin: 1595–1605; <
Medieval Latin inflammābilis, equivalent to
Latin inflammā(
re) to
inflame +
-bilis -ble Related forms in·flam·ma·bil·i·ty, in·flam·ma·ble·ness, noun
in·flam·ma·bly, adverb
non·in·flam·ma·bil·i·ty, noun
non·in·flam·ma·ble, adjective
non·in·flam·ma·ble·ness, noun
non·in·flam·ma·b·ly, adverb
un·in·flam·ma·bil·i·ty, noun
un·in·flam·ma·ble, adjective
Synonyms
2. fiery, volatile, choleric.
Usage note
Inflammable and flammable both mean “combustible.” Inflammable is the older by about 200 years. Flammable now has certain technical uses, particularly as a warning on vehicles carrying combustible materials, because of a belief that some might interpret the intensive prefix in- of inflammable as a negative prefix and thus think the word means “noncombustible.” Inflammable is the word more usually used in nontechnical and figurative contexts: The speaker ignited the inflammable emotions of the crowd.