Electricity. a disruptive discharge around or over the surface of a solid or liquid insulator.
the moment of conflagration or complete incineration caused by superheated air or combustibles.
verb (used without object)
Electricity. to have or experience a flashover.

1890–95; orig. noun use of verb phrase flash over

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World English Dictionary
flashover (ˈflæʃˌəʊvə)
1.  an electric discharge over or around the surface of an insulator
2.  the sudden and rapid spread of fire through the air, caused by the ignition of smoke or fumes from surrounding objects

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Witnesses had reported flames exploding out the windows-the main indicator of a
  flashover fire.
In five minutes a room can get so hot that everything in it ignites at once:
  this is called flashover.
The critical event in this fire was the onset of flashover conditions in the
Our instructors can demonstrate different phases of a fire, from inception to
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