spark plug


Definition of spark plug

1 : a part that fits into the cylinder head of an internal combustion engine and carries two electrodes separated by an air gap across which the current from the ignition system discharges to form the spark for combustion
2 : one that initiates or gives impetus to an undertaking

Other Words from spark plug

sparkplug \ ˈspärk-​ˌpləg How to pronounce spark plug (audio) \ transitive verb

Examples of spark plug in a Sentence

Recent Examples on the Web Instead, only one night later, Ward was the spark plug for the RedHawks, who badly needed a bounce-back victory. Casey Drottar,, 2 Dec. 2021 There’s no doubt that Gaga is the film’s commercial spark plug. Owen Gleiberman, Variety, 28 Nov. 2021 Lo and behold, the problem followed that spark plug. Ray Magliozzi, San Diego Union-Tribune, 19 Nov. 2021 Fudd could play a spark plug role off the bench for a while as she gets settled into the college game, which is actually a great scenario for both her and Geno. Alexa Philippou,, 9 Nov. 2021 The Doors’ sound was experimental and its singer was a charismatic spark plug that future frontmen would emulate. Troy L. Smith, cleveland, 30 Oct. 2021 More importantly, Navarro is a spark plug behind the scenes. Jack Harris, Los Angeles Times, 24 Aug. 2021 The message from La Russa was the physically fit, 28-year-old spark plug of the Sox lineup wasn’t injured but had sore legs. Paul Sullivan,, 24 Aug. 2021 And Chelsey Perry, who was released to make space for Hatar at the beginning of the season, has embraced her role as a spark plug off the bench. J.l. Kirven, The Indianapolis Star, 6 Aug. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'spark plug.' 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 spark plug

1903, in the meaning defined at sense 1

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Time Traveler for spark plug

Time Traveler

The first known use of spark plug was in 1903

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Dictionary Entries Near spark plug

spark photography

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Statistics for spark plug

Last Updated

17 Dec 2021

Cite this Entry

“Spark plug.” Dictionary, Merriam-Webster, Accessed 24 Jan. 2022.

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More Definitions for spark plug

spark plug


English Language Learners Definition of spark plug

: a part of an engine that produces a spark that makes the fuel burn

spark plug


Kids Definition of spark plug

: a device used in an engine to produce a spark that ignites a fuel mixture

More from Merriam-Webster on spark plug

Nglish: Translation of spark plug for Spanish Speakers Encyclopedia article about spark plug


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