propeller

[pruh-pel-er]
noun
1.
a device having a revolving hub with radiating blades, for propelling an airplane, ship, etc.
2.
a person or thing that propels.
3.
the bladed rotor of a pump that drives the fluid axially.
4.
a wind-driven, usually three-bladed, device that provides mechanical energy, as for driving an electric alternator in wind plants.

Origin:
1770–80; propel + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
propeller (prəˈpɛlə)
 
n
1.  a device having blades radiating from a central hub that is rotated to produce thrust to propel a ship, aircraft, etc
2.  a person or thing that propels

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
propeller   (prə-pěl'ər)  Pronunciation Key 
A device consisting of a set of two or more twisted, airfoil-shaped blades mounted around a shaft and spun to provide propulsion of a vehicle through water or air, or to cause fluid flow, as in a pump. The lift generated by the spinning blades provides the force that propels the vehicle or the fluid—the lift does not have to result in an actual upward force; its direction is simply parallel to the rotating shaft.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Some gliders can launch themselves with a retractable propeller turned by a
  small combustion engine.
Unlike the blades on old-fashioned propeller engines, these blades spin around
  at the back of the engine.
It uses a rotary device which in turn rotates a propeller to move.
The stress level in practice is obviously different from the for-real pressure
  of a propeller actually coming off.
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