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flare-up a sudden eruption of light or fire. [3 definitions]
flare up to suddenly burst forth in anger.
flaring of a flame, increasing suddenly and briefly in intensity. [2 definitions]
flash a sudden, brilliant light that vanishes almost instantly. [17 definitions]
flashback a past event that interrupts the forward action of a play, movie, novel, or the like. [2 definitions]
flashbulb an electric bulb that gives a brief flash of very bright light when ignited, used to illuminate a subject while a photograph is taken.
flash burn damage to body tissue from extreme radiated heat, esp. from a nuclear explosion.
flashcard any of a set of cards bearing words, numbers, or pictures, flashed briefly before a student or class to prompt a quick response in a drill.
flashcube a small, disposable cube with four flashbulbs that attaches to a camera and is automatically turned after each picture is taken.
flasher a mechanism that causes an electric light to go on and off automatically. [2 definitions]
flash flood a sudden and violent flood following an esp. heavy rainfall.
flashing sheet metal or other material used to reinforce and weatherproof building joints.
flash in the pan one who succeeds brilliantly for a brief time only.
flashlight a hand-held, usu. battery-powered lamp.
flash point the lowest temperature at which a combustible liquid will give a flash of light when heat is applied. [2 definitions]
flashy brilliant or impressive on the surface or for a short time only. [2 definitions]
flask a rounded or cone-shaped bottle with a narrow neck that sometimes widens at the top, often with a fitted top or stopper. [2 definitions]
flat1 having a horizontal surface. [17 definitions]
flat2 (chiefly British) a group of connected rooms forming a residence on one floor; apartment.
flatbed a truck or trailer having a flat or shallow platform with no sides or top as its body.
flatboat a flat-bottomed boat used for transporting goods on shallow waters.