easily set on fire; combustible; inflammable.

1805–15; < Latin flammā(re) to set on fire + -ble

flammability, noun

See inflammable.
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World English Dictionary
flammable (ˈflæməbəl)
liable to catch fire; readily combustible; inflammable
usage  Flammable and inflammable are interchangeable when used of the properties of materials. Flammable is, however, often preferred for warning labels as there is less likelihood of misunderstanding (inflammable being sometimes taken to mean not flammable). Inflammable is preferred in figurative contexts: this could prove to be an inflammable situation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1813, from L. flammare "to set on fire" + -able.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Investigators said the fire, which quickly spread, appeared to have been
  started on the fifth floor with a flammable liquid.
Language and writing are already rife with comparatively harmless word
  confusions: flammable vs inflammable, regardless vs.
Flaming hurricanes and flammable rain are scientifically impossible, according
  to myth-busting scientists.
In a fire-wise garden, use gravel or decomposed granite-not flammable bark
  mulch-to cover the bare ground around plants.
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