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n. Chiefly British
A spark plug.
(Automotive Engineering) a device screwed into the cylinder head of an internal-combustion engine to ignite the explosive mixture by means of an electric spark which jumps across a gap between a point earthed to the body of the plug and the tip of a central insulated rod. Also called: spark plug
1. a device that ignites the fuel mixture in a cylinder of an internal-combustion engine.
2. a person who leads, inspires, or animates.
spark′plug`, v.t. -plugged, -plug•ging.
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|Noun||1.||sparking plug - electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark|
electrical device - a device that produces or is powered by electricity