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English definition of “rudder”

rudder

noun [C] uk   /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 travelParts of ships and boatsParts of aeroplanes
(Definition of rudder from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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