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1. (Mechanical Engineering) 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. (Mechanical Engineering) a reciprocating engine in which the exhaust gases are expanded in a turbine to drive a turbocharger
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014