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compound engine

noun
1.
a steam engine in which the steam is expanded in more than one stage, first in a high-pressure cylinder and then in one or more low-pressure cylinders
2.
a reciprocating engine in which the exhaust gases are expanded in a turbine to drive a turbocharger
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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