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Definition of: fluorescence
(fl
′ə·res′əns) noun Physics
1. The property of certain substances to absorb radiation of a particular wavelength and to re-emit it as light of a different, usually greater, wavelength; the emitted radiation persists only as long as the stimulus is active: distinguished from phosphorescence.
2. The light so produced. [<FLUOR(SPAR); coined on analogy with OPALESCENCE]
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