- 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.
- 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