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1. the glow left after a light has disappeared, such as that sometimes seen after sunset
2. the glow of an incandescent metal after the source of heat has been removed
3. Physics luminescence persisting on the screen of a cathode-ray tube or in a gas-discharge tube after the power supply has been disconnected
A broad, high arch of radiance or glow seen occasionally in the western sky above the highest clouds in deepening twilight, caused by the scattering effect of very fine particles of dust suspended in the upper atmosphere.
The transient decay of a plasma after the power has been turned off.
The glow in a material after the removal of an external source of fire to which it is exposed, or after the cessation (natural or induced) of flames.