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

   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