pyrophoric

[pahy-ruh-fawr-ik, -for-]
adjective Chemistry.
capable of igniting spontaneously in air.

Origin:
1830–40; < Greek pyrophór(os) fire-bearing (see pyro-, -phorous) + -ic

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pyrophoric (ˌpaɪrəʊˈfɒrɪk)
 
adj
1.  (of a chemical) igniting spontaneously on contact with air
2.  (of an alloy) producing sparks when struck or scraped: lighter flints are made of pyrophoric alloy
 
[C19: from New Latin pyrophorus, from Greek purophoros fire-bearing, from pur fire + pherein to bear]

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Example sentences
The chemical requires careful handling, because as a pyrophoric, it catches
  fire when exposed to air.
However, this is a pyrophoric reaction and extremely exothermic.
Uranium is a heavy, silvery-white metal which is pyrophoric when finely divided.
Thus, bulk aluminum is used as a structural metal, but finely divided aluminum
  is pyrophoric.
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