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Definition of spark plug

spark plug

(UK: sparking plug)
Plural:spark plugs
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• noun

1

A device fitted into the cylinder head of an internal-combustion engine that ignites the compressed fuel-air mixture by means of an electric spark.

Example

"The mechanic replaced a fouled spark plug to resolve the engine's persistent misfire."

2

A highly energetic or motivating person who inspires others and drives a group or project forward.

Example

"As the captain of the team, she was the spark plug who kept everyone's spirits high during difficult matches."

Synonyms
View all synonyms for spark plug
Antonyms
View all antonyms for spark plug

• Nearby Words

sparing
sparingly
spark
spark plug
sparker
sparkingly
sparkle

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Spark plug. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/spark-plug
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