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English definition of “rudder”

rudder

noun [C]     /ˈrʌd.ər/ US  //
a flat piece of wood or metal at the back of a boat or aircraft , moved from side to side in order to control the direction of travel Parts of ships and boatsParts of aeroplanes
(Definition of rudder noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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