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[flash-oh-ver] /ˈflæʃˌoʊ vər/
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.
Origin of flashover
1890-95; orig. noun use of verb phrase flash over Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for flashover
  • 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 kitchen.
  • Our instructors can demonstrate different phases of a fire, from inception to flashover.
  • flashover is the critical point because of its impact on victims and fire suppression resources.
  • Live and animated sequences present the facts about fire, including a dramatic flashover demonstration.
  • Air also provides insulation that can recover if there is a flashover.
  • Materials are sought that will slow or prevent flashover.
  • The combination of temperature and air pressure that gives the lowest gap flashover voltage is high temperature and low pressure.
  • The fires of concern may include, for example, a large item of furniture with or without flashover of the compartment.
British Dictionary definitions for flashover


an electric discharge over or around the surface of an insulator
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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