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steam engine

noun
1.
an engine worked by steam, typically one in which a sliding piston in a cylinder is moved by the expansive action of the steam generated in a boiler.
Origin
1745-1755
1745-55
Related forms
steam-engine, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for steamengine

steam engine

n.

1751; earlier in the same sense was fire engine, atmospheric engine.

Online Etymology Dictionary, © 2010 Douglas Harper
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steamengine in Science
steam engine  

An engine in which the energy of hot steam is converted into mechanical power, especially an engine in which the force of expanding steam is used to drive one or more pistons. The source of the steam is typically external to the part of the machine that converts the steam energy into mechanical energy. Compare internal-combustion engine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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