light bulb

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noun \ˈlīt-ˌbəlb\
variants: or

lightbulb

Definition of light bulb

  1. :  an electric lamp: such asa :  one in which a filament gives off light when heated to incandescence by an electric current —called also incandescent, incandescent lampb :  fluorescent lamp

Illustration of light bulb

First Known Use of light bulb

1884


LIGHT BULB Defined for Kids

light bulb

noun

Definition of light bulb for Students

  1. :  a lamp in which a glow is produced by the heating of a wire by an electric current


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