- 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.
- Electricity. to have or experience a flashover.
Origin of flashover
First recorded in 1890–95; orig. noun use of verb phrase flash over
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- 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