light bulb

\ ˈlīt-ˌbəlb How to pronounce light bulb (audio) \
variants: or lightbulb

Definition of light bulb

: 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

Illustration of light bulb

Illustration of light bulb

light bulb (incandescent): 1 bulb containing gas, 2 filament, 3 connecting and supporting wires, 4 exhaust tube, 5 screw base, 6 base contact

Examples of light bulb in a Sentence

Recent Examples on the Web

According to professional photographers, energy-saving light bulbs are probably not to blame., "According to professional photographers, energy-saving light bulbs are probably not to blame.," 14 Sep. 2019 On the contrary, the light bulb aisles at the stores have expanded several times over and now take up huge shelf space featuring all the LED and energy efficient bulbs. Letter Writers, Twin Cities, "Letters: St. Paul’s bad garbage contract discourages customer service and makes robots of haulers, apparently," 8 Sep. 2019 Her longtime friend and colleague Vermont Sen. Bernie Sanders also laughed off questions about energy-saving light bulbs. Wesli Jones, CNN, "Must-see moments from the CNN climate crisis town hall," 5 Sep. 2019 Energy-saving light bulbs are the latest Obama-era environmental initiative to face a rollback by the Trump administration. Sophie Lewis, CBS News, "Trump rolls back Obama-era regulations on energy-efficient light bulbs," 4 Sep. 2019 But a smart light bulb also offers a way into the entire home network, which is typically controlled from a homeowner’s smartphone. Diego Mendoza-moyers,, "5G: What is it, and how will it change your life?," 2 Sep. 2019 The manufacturing giant, with more than a century of innovations in household goods, became the butt of jokes after a video of one of its smart light bulbs went viral this week. Richard Clough,, "How many IT pros does it take to reset a GE smart bulb? More than you’d think," 20 June 2019 So even all our light bulbs are connected to an app. Nigel Smith,, "Why Aubrey Plaza, Who's 'Not a Big Horror Fan,' Was 'So Excited' by Child's Play," 18 June 2019 One guy in line was wearing a suit covered with something like 250 light bulbs. al, "Auditioning for ‘American Idol?’ Taylor Hicks has some advice," 13 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'light bulb.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of light bulb

1884, in the meaning defined above

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Statistics for light bulb

Last Updated

20 Sep 2019

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Time Traveler for light bulb

The first known use of light bulb was in 1884

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More Definitions for light bulb

light bulb


English Language Learners Definition of light bulb

: a glass bulb or tube that produces light when it is supplied with electricity

light bulb


Kids Definition of light bulb

: a lamp in which a glow is produced by the heating of a wire by an electric current

More from Merriam-Webster on light bulb

Thesaurus: All synonyms and antonyms for light bulb

Comments on light bulb

What made you want to look up light bulb? Please tell us where you read or heard it (including the quote, if possible).


miscellaneous remnants or debris

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