Spark Plug Definition

noun
An electrical device threaded into the cylinder of an internal-combustion engine to ignite the fuel mixture by producing timed sparks between electrodes.
Webster's New World
One who gives life or energy to an endeavor.
American Heritage
A person or thing that inspires, activates, or advances something.
Webster's New World
Synonyms:

Other Word Forms of Spark Plug

Noun

Singular:
spark plug
Plural:
spark-plugs

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spark plug