an engine, as a turbine, in which the impelling fluid produces torque directly rather than by acting upon reciprocating parts.
a revolving radial engine.
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Origin of rotary engine
First recorded in 1810–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an internal-combustion engine having radial cylinders that rotate about a fixed crankshaft
an engine, such as a turbine or wankel engine, in which power is transmitted directly to rotating components
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012