Sparking-plug

sparking plug

noun British.
spark plug ( def 1 ).

Origin:
1900–05

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World English Dictionary
sparking plug
 
n
Also called: spark plug 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

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