1.NounSynonym of fluorescent lamp (“a gas-discharge lamp that uses fluorescence to produce visible light, especially one consisting of a tube filled with mercury vapour which emits ultraviolet radiation when an electric current is passed through it, causing fluorescence when the radiation hits a phosphor coating on the interior of the tube”); also, a light fixture containing one or more fluorescent lamps.
2.NounA person who is slow to reply or understand; a dim-witted person.