GNU Collaborative International Dictionary of English

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Found one definition

1.       
   lightbulb, light bulb n. A glass bulb with metallic contacts on the outside connected to a wire filament (usually tungsten) inside that emits light when heated by passage of electricity through the filament; -- used as the replaceable light-emitting component of an electric lamp, flashlight, lighting fixture, etc.
   Syn. -- light bulb, bulb, incandescent lamp, electric light, electric-light bulb.
   WordNet 1.5
   +PJC