tail rotor

World English Dictionary
tail rotor
 
n
a small propeller fitted to the rear of a helicopter to counteract the torque reaction of the main rotor and thus prevent the body of the helicopter from rotating in an opposite direction

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WordNet
tail rotor

noun
rotor consisting of a rotating airfoil on the tail of a single-rotor helicopter; keeps the helicopter from spinning in the direction opposite to the rotation of the main rotor 
WordNet® 3.0, © 2006 by Princeton University.
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