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
Examples of spark plug in a Sentence
Recent Examples on the Web
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
Just like your car, your lawn mower occasionally needs maintenance in the form of new spark plugs, an oil change, new tires, and a new air filter.
—Kamron Sanders, Better Homes & Gardens, 28 Sep. 2024
When the wire is disconnected, carefully turn the spark plug counterclockwise to loosen and remove it.
—Timothy Dale, Better Homes & Gardens, 27 Sep. 2024
See all Example Sentences for spark plug 
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.
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
Just like your car, your lawn mower occasionally needs maintenance in the form of new spark plugs, an oil change, new tires, and a new air filter.
—Kamron Sanders, Better Homes & Gardens, 28 Sep. 2024
When the wire is disconnected, carefully turn the spark plug counterclockwise to loosen and remove it.
—Timothy Dale, Better Homes & Gardens, 27 Sep. 2024
See all Example Sentences for spark plug
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 27 Nov. 2024.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share