- A repeatable and artificially produced burst of bright light. Such a flash is usually generated by applying a high voltage to an electrode of a tube containing an inert gas such as xenon. The gas becomes ionized, which permits it to rapidly discharge the energy previously stored in a capacitor. Used, for instance, in photography. Also called photoflash, flash (2), or strobe (3).
- noun a device used in still photography to produce a very bright flash of light, caused by passing an electric charge through a gas-filled tube