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WordReference Random House Learner's Dictionary of American English © 2024rud•der /ˈrʌdɚ/USA pronunciation n. [countable]- Nautical, Naval Termsa vertical blade at the rear of a ship or plane that can be turned to control direction.
- any means of directing or guiding a course.
rud•der•less, adj. WordReference Random House Unabridged Dictionary of American English © 2024rud•der (rud′ər),USA pronunciation n. - Nautical, Naval Termsa vertical blade at the stern of a vessel that can be turned horizontally to change the vessel's direction when in motion.
- Aeronauticsa movable control surface attached to a vertical stabilizer, located at the rear of an airplane and used, along with the ailerons, to turn the airplane.
- any means of or device for governing, directing, or guiding a course, as a leader or principle:His ideas provided a rudder for the new company.
- bef. 900; Middle English rodder, rother, ruder, Old English rōther; cognate with Old Frisian rōther, Middle Dutch rōder (Dutch roer), Old High German ruodar (German Ruder); akin to row2
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