noun \ˈlīt-ˌbəlb\

Definition of LIGHTBULB

:  an electric lamp: as
a :  one in which a filament gives off light when heated to incandescence by an electric current —called also incandescent, incandescent lamp
b :  fluorescent lamp

Variants of LIGHTBULB

light·bulb or light bulb

Illustration of LIGHTBULB

First Known Use of LIGHTBULB



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