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rudder noun

  /ˈɹʌdə(ɹ)/ , /ˈɹʌdɚ/
  • (nautical) An underwater vane used to steer a vessel. The rudder is controlled by means of a wheel, tiller or other apparatus (modern vessels can be controlled even with a joystick or an autopilot).
 Ruder, Steuerruder, Steuer
  • (aeronautics) A control surface on the vertical stabilizer of a fixed-wing aircraft or an autogyro. On some craft, the entire vertical stabilizer comprises the rudder. The rudder is controlled by foot-operated control pedals.
 Ruder, Steuerruder
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