lightbulb

n.

1.

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.

Noun

1.

lightbulb - electric lamp consisting of a glass bulb containing a wire filament (usually tungsten) that emits light when heated Synonyms: electric light, electric-light bulb, incandescent lamp, light bulb, bulb

bulb, electric lamp, electric light, electric-light bulb, filament, incandescent lamp, light bulb