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antitorque rotor

[an-tee-tawrk, an-tahy-] /ˌæn tiˈtɔrk, ˌæn taɪ-/
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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