rotary engine

an engine, as a turbine, in which the impelling fluid produces torque directly rather than by acting upon reciprocating parts.
a revolving radial engine.

1810–20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rotary engine
1.  an internal-combustion engine having radial cylinders that rotate about a fixed crankshaft
2.  an engine, such as a turbine or wankel engine, in which power is transmitted directly to rotating components

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Then you have the steam rotary engine that will run mainly on water for steam and fuel.
In a rotary engine, such as a jet turbine, power is supplied directly to vanes or other rotating parts.
One early type was the rotary engine, where the entire engine turned.
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