noun Date: 1903 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, one that initiates or gives impetus to an undertaking, sparkplug transitive verb
SPARK PLUG
Meaning of SPARK PLUG in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012