Illustration of light bulb
- 1 bulb containing gas
- 2 filament
- 3 connecting and supporting wires
- 4 exhaust tube
- 5 screw base
- 6 base contact
light bulb
noun
variants
or lightbulb
plural light bulbs or lightbulbs
: an electric lamp: such as
a
: one in which a filament gives off light when heated to incandescence by an electric current
called also incandescent, incandescent lamp
b
: one having a coating of fluorescent material on its inner surface that emits visible light : fluorescent lamp
especially
: compact fluorescent light
c
: one using LEDs to generate light
Examples of light bulb in a Sentence
Recent Examples on the Web
Is there any truth to the claims that yellow light bulbs keep insects away?
—
Brandee Gruener, Southern Living, 17 Apr. 2025
Many federal standards, including on light bulbs, electric motors and commercial heating and cooling equipment, have been based on those previously adopted by one or more states.
—David J. Vogel, The Conversation, 17 Apr. 2025
Wireless light bulb Rechargeable light bulbs are an easy alternative to traditional bulbs.
—Cody Godwin, USA TODAY, 21 Mar. 2025
Keep Light Bulbs From Sticking Outdoor light bulbs can have a knack for sticking in the socket after long periods of time, leaving you with the task of trying to unscrew a stubborn bulb without breaking the glass.
—Kaitlyn Yarborough, Southern Living, 4 Apr. 2025
See All Example Sentences for light bulb
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Brandee Gruener, Southern Living, 17 Apr. 2025
Many federal standards, including on light bulbs, electric motors and commercial heating and cooling equipment, have been based on those previously adopted by one or more states.
—David J. Vogel, The Conversation, 17 Apr. 2025
Wireless light bulb Rechargeable light bulbs are an easy alternative to traditional bulbs.
—Cody Godwin, USA TODAY, 21 Mar. 2025
Keep Light Bulbs From Sticking Outdoor light bulbs can have a knack for sticking in the socket after long periods of time, leaving you with the task of trying to unscrew a stubborn bulb without breaking the glass.
—Kaitlyn Yarborough, Southern Living, 4 Apr. 2025
See All Example Sentences for light bulb
Cite this Entry
“Light bulb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/light%20bulb. Accessed 26 Apr. 2025.
Copy CitationKids Definition
lightbulb
noun
light·bulb
ˈlīt-ˌbəlb 
: an electric lamp: as
a
: one in which a filament gives off light when heated by an electric current
called also incandescent lamp
b
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