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rudder

Pronunciation: /ˈrʌdə/

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Definition of rudder

noun

a flat piece hinged vertically near the stern of a boat or ship for steering.
a vertical aerofoil pivoted from the tailplane of an aircraft, for controlling movement about the vertical axis.
[mass noun] application of a rudder in steering a boat, ship, or aircraft:bring the aircraft to a stall and apply full rudder a small amount of extra rudder