rotary-engine

rotary engine

noun
1.
an engine, as a turbine, in which the impelling fluid produces torque directly rather than by acting upon reciprocating parts.
2.
a revolving radial engine.

Origin:
1810–20

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rotary engine
 
n
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

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