spark plug

noun

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
sparkplug transitive verb

Examples of spark plug in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Inside a vehicle, noise is generated by spark plugs, electric motors and cell phones, Daniel Shwartzberg, the company’s director of business development and system solutions, said during the investor day presentation. Bill Koenig, Forbes, 21 Nov. 2024 The two receivers were the spark plugs in a successful two-minute drive for Herbert against the starting defense. Daniel Popper, The Athletic, 30 July 2024 In a gas engine, a small device called a spark plug ignites the compressed fuel-air mixture. Michael Leamy, Discover Magazine, 2 Nov. 2024 Step 2: Turn Off Mower: After 15 minutes turn off the engine, then disconnect the spark plug to avoid accidentally starting the mower during the oil change. Timothy Dale, Better Homes & Gardens, 12 Oct. 2024 See all Example Sentences for spark plug 

Word History

First Known Use

1903, in the meaning defined at sense 1

Time Traveler
The first known use of spark plug was in 1903

Dictionary Entries Near spark plug

Cite this Entry

“Spark plug.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spark%20plug. Accessed 1 Dec. 2024.

Kids Definition

spark plug

noun
1
: a device used in an engine to produce a spark that ignites a fuel mixture
2
: one that begins something or drives something forward

More from Merriam-Webster on spark plug

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!