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fluorescence [flu(ə)'res(ə)ns] n
light.	flúoresceńs
English thesaurus
fluorescence [flu(ə)'res(ə)ns] n
jewl.	Refers to the invisible wavelengths of light that become "visible" when exposed to ultraviolet radiation. Gems or pearls that exhibit color under ultraviolet light - color not seen under normal lighting conditions - are exhibiting fluorescence.