definitions

inflammable

[ in-flam-uh-buhl ]
/ ɪnˈflæm ə bəl /
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adjective

capable of being set on fire; combustible; flammable.
easily aroused or excited, as to passion or anger; irascible: an inflammable disposition.

noun

something inflammable.

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Why Do “Flammable” And “Inflammable” Mean The Same Thing?Why are these two words so confusing? Well, flammable and inflammable both mean “able to be set on fire.” Strangely, the "in" prefix in inflammable doesn't make the word mean "not flammable," as you might think.
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RELATED WORDS

combustible, dangerous, flammable, hazardous, incendiary, risky, unsafe, burnable, ignitable

Nearby words

infirmary, infirmity, infix, infl., inflame, inflammable, inflammation, inflammatory, inflammatory bowel disease, inflammatory carcinoma, inflammatory lymph

Origin of inflammable

1595–1605; < Medieval Latin inflammābilis, equivalent to Latin inflammā(re) to inflame + -bilis -ble

Related forms

Can be confused

inflammable inflammatory

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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for inflammable

British Dictionary definitions for inflammable

inflammable

/ (ɪnˈflæməbəl) /

adjective

liable to catch fire; flammable
readily aroused to anger or passion

noun

something that is liable to catch fire

Derived Forms

inflammability or inflammableness, nouninflammably, adverb

xref

See flammable
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012