Definition of power stroke in English:

power stroke

Syllabification: pow·er stroke

noun

  • The stage of the cycle of an internal combustion engine in which the piston is driven outward by the expansion of gases.
    More example sentences
    • Deactivation requires only 40 or so milliseconds and is timed to occur immediately after the power stroke so the disabled cylinder remains filled with exhaust gas.
    • The result is that a portion of the following power stroke is wasted, trying to burn already deoxygenated exhaust.
    • We really only want the top ring to seal against the cylinder wall primarily on the power stroke; on the other three strokes, it's just along for the ride.

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Word of the day skosh
Pronunciation: skəʊʃ
noun
a small amount; a little