noun
electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity (Freq. 2)
• Syn: ↑lightbulb, ↑bulb, ↑incandescent lamp, ↑electric light, ↑electric-light bulb
• Hypernyms: ↑electric lamp
• Part Meronyms: ↑filament
* * *
noun* * *
an electric light.
[1880-85]
* * *
light bulb noun
A glass bulb containing a low-pressure gas and a metal filament which glows when an electric current is passed through it, one of the most common methods of electric lighting
• • •
Main Entry: ↑light
* * *
a glass object that you put in an electric light to produce light. A light bulb is often simply called a bulb . 
* * *
light bulb,
= incandescent lamp. (Cf. ↑incandescent lamp)
* * *
(also lightbulb) n. a glass bulb inserted into a lamp or a socket in a ceiling, that provides light by passing an electric current through a pocket of inert gas
* * *
noun, pl ⋯ bulbs [count]
: a glass bulb or tube that produces light when it is supplied with electricity
change a light bulb that has burned out
— called also bulb
a light bulb goes off/on
chiefly US informal
◇ When a light bulb goes off/on (in your head), you suddenly understand something or have a great idea.
After thinking about the problem for several days, a light bulb went off in her head, and she knew how to solve it.
* * *
= ↑bulb
Useful english dictionary. 2012.