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Noun
tail rotor
anti-torque rotor
Definition: 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
Definition: A small rotor mounted vertically at the end of the tail of a single-rotor helicopter so as to develop thrust in the same direction as the main rotor's rotation, to counter the torque effect created by the main rotor.