1. Any of various devices that generate light and often heat, especially:
a. An electric device having a socket for a light bulb, especially a free-standing piece of furniture.
b. A device that gives off ultraviolet, infrared, or other radiation, used for therapeutic purposes.
c. A light bulb: a spotlight fitted with a metal-halide lamp.
d. A vessel containing oil or alcohol burned through a wick.
e. A lantern or fixture that gives off light by burning gas, usually by means of a mantle.