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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The reciprocating engine or gas turbine drive an electrical generator which
  produces electricity.
Another name for a reciprocating engine is an internal-combustion engine.
Biogas generated from the digester is burned in a reciprocating engine set.
Turbine or jet fuel is detrimental to the reciprocating engine and extended use
  of avgas can damage turbine engines.
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