heat engine

noun Thermodynamics.
a mechanical device designed to transform part of the heat entering it into work.

Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
heat engine
 
n
an engine that converts heat energy into mechanical energy

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
To produce any kind of useful propulsion energy from heat requires a heat
  engine.
When the heat engine stops, the flexible shaft stops.
There are many ways to arrange that, but it all begins with a heat engine and
  the fuel used to make the heat.
Time is something measured by a clock, which is a heat engine that requires a
  free energy source.
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