Dictionary

spark plug

noun

: a part of an engine that produces a spark that makes the fuel burn

Full Definition of SPARK PLUG

1
:  a part that fits into the cylinder head of an internal combustion engine and carries two electrodes separated by an air gap across which the current from the ignition system discharges to form the spark for combustion
2
:  one that initiates or gives impetus to an undertaking
spark·plug \ˈspärk-ˌpləg\ transitive verb

First Known Use of SPARK PLUG

1903

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