RUDDER

n. movable vertical blade located at the rear of an airplane or ship and used for steering

A rudder is a device used to steer ships, boats, submarines, aircraft, hovercraft or other conveyances that move through air or water. Rudders operate by re-directing the flow of air or water past the hull or fuselage, thus imparting a turning or yawing motion to the craft. In basic form, a rudder is a flat plane or sheet of material attached with hinges to the craft's stern, tail or after end. Often rudders are shaped so as to minimize hydrodynamic or aerodynamic drag. On simple watercraft, a tiller—essentially, a stick or pole acting as a lever arm—may be attached to the top of the rudder to allow it to be steered by a helmsman. In larger vessels, cables, pushrods and hydraulics may be used to link rudders to steering wheels. In typical aircraft, pedals operate rudders via mechanical linkages.
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Noun
1. a hinged vertical airfoil mounted at the tail of an aircraft and used to make horizontal course changes
(hypernym) airfoil, aerofoil, control surface, surface
(part-holonym) vertical tail
2. (nautical) steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel
(hypernym) steering system, steering mechanism
(part-holonym) vessel, watercraft
(part-meronym) rudder blade
(classification) seafaring, navigation, sailing

(n.)
The mechanical appliance by means of which a vessel is guided or steered when in motion. It is a broad and flat blade made of wood or iron, with a long shank, and is fastened in an upright position, usually by one edge, to the sternpost of the vessel in such a way that it can be turned from side to side in the water by means of a tiller, wheel, or other attachment.
  

(n.)
Fig.: That which resembles a rudder as a guide or governor; that which guides or governs the course.
  

(n.)
A riddle or sieve.
  

To dream of a rudder, you will soom[sic] make a pleasant journey to foreign lands, and new friendships will be formed.

A broken rudder, augurs disappointment and sickness.