Muriel, maybe, with advert for engine part

Wikipedia Word definitions in Wikipedia
Spark plug may refer to: Spark plug , an electrical device in some internal combustion engines and ignites fuel by means of an electric spark Spark plug, a rod of uranium or plutonium in a hydrogen bomb used to heat the fusion fuel to the point of nuclear ...

WordNet Word definitions in WordNet
n. electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark [syn: sparking plug , plug ]

Wiktionary Word definitions in Wiktionary
n. The part of an internal combustion engine which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Spark plug \Spark plug\ In internal-combustion engines with electric ignition, a plug, screwed into the cylinder head, connected with the induction coil or magneto circuit on the outside, and used to produce a spark to ignite the fuel-air mixture in the ...

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Always remove the lead from the spark plug of petrol machines and unplug electric models before cleaning or servicing. ▪ For the sake of the team, she is willing to be the spark plug . ▪ He was a spark plug at the top of the ...