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
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Portable solar light bulbs for chicken coop: $23.98 Lighting up your chicken coop is easy to do.
—
Christopher Murray
May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 1 May 2025
At the longstanding company that owns WWD, the visual culture historian tells me there was a light bulb moment that led to the creation of the book Black in Fashion: 100 Years of Style, Influence & Culture.
—Robyn Mowatt, Essence, 28 Feb. 2025
In addition to selecting the right fixtures and light bulbs, Lerner says their placement within the bathroom matters as well.
—Maria Sabella, Better Homes & Gardens, 14 Apr. 2025
Tens of thousands of customers around the country already get everything from lunchtime goodies and replacement light bulbs to vaccines and prescriptions via drone.
—Seth Jacobson, USA TODAY, 19 Mar. 2025
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Christopher Murray
May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 1 May 2025
At the longstanding company that owns WWD, the visual culture historian tells me there was a light bulb moment that led to the creation of the book Black in Fashion: 100 Years of Style, Influence & Culture.
—Robyn Mowatt, Essence, 28 Feb. 2025
In addition to selecting the right fixtures and light bulbs, Lerner says their placement within the bathroom matters as well.
—Maria Sabella, Better Homes & Gardens, 14 Apr. 2025
Tens of thousands of customers around the country already get everything from lunchtime goodies and replacement light bulbs to vaccines and prescriptions via drone.
—Seth Jacobson, USA TODAY, 19 Mar. 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 13 Jun. 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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