Definition: Emission of a longer wavelength radiation by a substance as a consequence of absorption of energy from a shorter wavelength radiation, continuing only as long as the stimulus is present; distinguished from phosphorescence, in which emission persists for a perceptible period of time after the stimulus has been removed.
See: photoelectric effect
[fluorspar + -escence, inchoative suffix]
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Examples: glitazone, GI cocktail, etc.