Definition of light bulb
: 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
LIGHT BULB Defined for Kids
Definition of light bulb for Students
: a lamp in which a glow is produced by the heating of a wire by an electric current
Seen and Heard
What made you want to look up light bulb? Please tell us where you read or heard it (including the quote, if possible).