reciprocating engine

any engine employing the rectilinear motion of one or more pistons in cylinders.
Also called displacement engine, piston engine.

1815–25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reciprocating engine
an engine in which one or more pistons move backwards and forwards inside a cylinder or cylinders

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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