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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.
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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
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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