fluorescence

flu·o·res·cence

noun \-ˈes-^ən(t)s\

Definition of FLUORESCENCE

: luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usually at a different wavelength and that ceases almost immediately when the incident radiation stops; also : the radiation emitted

—flu·o·res·cent \-ˈes-^ənt\ adjective