From Middle English rodder, rother, ruder, from Old English rōþor (“rudder”), from Proto-Germanic *rōþrą (“rudder"; literally, "paddle, instrument for rowing”) (compare Dutch and West Frisian roer, German Ruder), from Proto-Germanic *rōaną, from Proto-Indo-European *h₁reh₁- (“to row”) + Proto-Germanic *-þrą, *-þraz, instrumental suffix. Akin to Old English rōwan (“to row”). More at rōwan, -þor.
rudder (plural rudders)
- (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).
- (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.
- A riddle or sieve.
- (figuratively) That which resembles a rudder as a guide or governor; that which guides or governs the course.
- For rhyme the rudder is of verses.
underwater vane used to steer a vessel
control surface of an aircraft