spark plug
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
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First Known Use of spark plug
1903
SPARK PLUG Defined for English Language Learners
spark plug
Definition of spark plug for English Language Learners
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: a part of an engine that produces a spark that makes the fuel burn
SPARK PLUG Defined for Kids
spark plug
Definition of spark plug for Students
: a device used in an engine to produce a spark that ignites a fuel mixture
Learn More about spark plug
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See words that rhyme with spark plug Spanish Central: Translation of spark plug Nglish: Translation of spark plug for Spanish speakers Britannica.com: Encyclopedia article about spark plug
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