reciprocating engine

reciprocating engine

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


Origin:
1815–25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Reciprocating engine is always a great word to know.
So is ninnyhammer. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
Collins
World English Dictionary
reciprocating engine
 
n
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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