four-stroke engine

Definitions of four-stroke engine
  1. noun
    an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke
    synonyms: four-stroke internal-combustion engine
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    type of:
    ICE, internal-combustion engine
    a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine
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