simple engine

noun

Definition of simple engine

  1. 1 :  an engine (such as a steam engine) in which the expansion is completed in a single phase and exhausted to atmosphere or condenses after a single stroke of the piston — compare compound engine

  2. 2 :  a steam engine in which the live steam is fed directly to the cylinders and after a single use of its expansive force is allowed to escape through the exhaust —called also compound engine

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