anti-torque rotor

antitorque rotor

[an-tee-tawrk, an-tahy-]
noun Aeronautics.
(on certain helicopters) a small rotor on the tail, turning in the vertical plane and providing a thrust whose torque opposes and compensates for the torque of the main rotor.

Origin:
anti- + torque

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
anti-torque 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 [syn: tail rotor
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