(n.) That property which some transparent bodies have of producing at their surface, or within their substance, light different in color from the mass of the material, as when green crystals of fluor spar afford blue reflections. It is due not to the difference in the color of a distinct surface layer, but to the power which the substance has of modifying the light incident upon it. The light emitted by fluorescent substances is in general of lower refrangibility than the incident light.

autoluminescence bioluminescence cathode luminescence chemicoluminescence chemiluminescence corposant crystalloluminescence double corposant electroluminescence fata morgana fox fire ignis fatuus luciferase luciferin luminescence luminophor marshfire noctiluscence phosphor phosphorescence photoluminescence radioluminescence thermoluminescence tribofluorescence triboluminescence tribophosphorescence wisp witch fire