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noun light bulb, lightbulb 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. Synonyms: light bulb, bulb, incandescent lamp, electric light, electric-light bulb.
Collaborative International Dictionary of English 0.48
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