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reciprocating engine

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noun
  1. any engine employing the rectilinear motion of one or more pistons in cylinders.

Origin of reciprocating engine

First recorded in 1815–25
Also called displacement engine, piston engine.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for displacement engine

reciprocating engine

noun
  1. an engine in which one or more pistons move backwards and forwards inside a cylinder or cylinders
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012