(astronomy) The sudden beginning of the burning of helium in the core of stars of intermediate mass or on the surface of an accreting white dwarf.

(US) A sudden, but brief, sensation of heat over the entire body; a common symptom of menopause.

plural of flash flood

(meteorology) A sudden, rapid flood, usually of short duration and local impact.

(of paint used on an aircraft) Intended to reflect the thermal radiation from a nuclear detonation.

plural of flash drive

In video or film editing, a very short shot (usually one frame, but occasionally several) appearing in a sequence of images. Flash frames are usually the inadvertent result of an editing mistake or an equipment problem. From time to time, however, they are inserted intentionally for creative reasons.

Taking photographs using a camera with a flash.

(cooking, transitive) To fry (food) for a short time at a high heat, typically to brown a coating without overcooking the food inside.

(UK, informal) pertaining to a scam where a motorist flashes their headlights to indicate to another driver to proceed against normal give-way rules, then runs in to them and sues for damages.