Definitions for "lightbulb"
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.
electric lamp consisting of a glass bulb containing a wire filament (usually tungsten) that emits light when heated
a coil of wire in a near-vacuum
Keywords:  screw, rectangular, stem, circle
a circle with a rectangular stem for the screw
Keywords:  iii, investigation, topic, lets, select
a form which lets students select a topic for a Type III Investigation