fluo·res·cent 
(fl-rĕsənt, flô-, flō-)
(fl-rĕsənt, flô-, flō-)adj.
1.
a. Of or relating to fluorescence.
b. Exhibiting or produced by fluorescence: fluorescent corals; fluorescent light.
2. Glowing as if with fluorescence; vivid: bright fluorescent colors.
3. Of or relating to a light bulb that produces visible light by fluorescence, especially a glass tube whose inner wall is coated with a material that fluoresces when an electrical current causes a vapor within the tube to discharge photons.
n.
1. A fluorescent light bulb.
2. A lamp that is fitted with a fluorescent light bulb.