spark plug Meaning and Definition
1. n. electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark
A spark plug (sometimes, in British English, a sparking plug, and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine.
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