GNU Collaborative International Dictionary of English
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Found one definition
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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]