flu̇(ə)ˈres ə n(t)s, flōˈ-, flȯˈ- noun
( -s )
Etymology: fluor (fluorite) + -escence
1. : the emission by a substance of electromagnetic radiation especially in the form of visible light as the immediate result of and only during the absorption of radiation from some other source ; also : the property of emitting such radiation
2. : the radiation emitted during fluorescence — compare luminescence