Etymology
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flammable (adj.)

1813, from stem of Latin flammare "to set on fire" (from flamma "flame, blazing fire;" see flame (n.)) + -able. In modern (20c.) use, a way to distinguish from the ambiguity of inflammable.

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Definitions of flammable

flammable (adj.)
easily ignited;
Synonyms: inflammable
From wordnet.princeton.edu