rudder

rud•der 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.

rud•der 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

rud′dered, adj.
rud′der•less, adj.
rud′der•like′, adj.

Collins Concise English Dictionary © HarperCollins Publishers::

rudder /ˈrʌdə/ n

a pivoted vertical vane that projects into the water at the stern of a vessel and can be controlled by a tiller, wheel, or other apparatus to steer the vessel
a vertical control surface attached to the rear of the fin used to steer an aircraft, in conjunction with the ailerons
anything that guides or directs

Etymology: Old English rōther; related to Old French rōther, Old High German ruodar, Old Norse rōthr. See row²ˈrudderless adj

'rudder' also found in these entries (note: many are not synonyms or translations):

Collocations: a [bird, fish] caught in the rudder, something got [trapped, caught, stuck] in the rudder, rudders that help [steer, turn], more...

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