Definition of spark plug in English:

spark plug

Syllabification: spark plug

noun

  • A device for firing the explosive mixture in an internal combustion engine.
    More example sentences
    • Then, without the spark plug in place, pull the starter cord slowly, distributing the oil through the cylinder.
    • Sedlack first tried to disable a snowmobile by pulling out a spark plug.
    • He looked over at the battery and saw that the cap on a spark plug was loose.

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Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space