(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).

plural of rudder

Having a rudder or rudders.

(aviation) The degree of control that the rudder can exert over the yawing motion of an aircraft; related to rudder design and airspeed.

Without a rudder. / Lacking guidance or direction.

In a rudderless way.

Any of various unrelated fish that have the habit of following ships / Centrolophus niger, a medusafish, the only member of the genus Centrolophus.

(nautical) The hole in the deck through which the rudderpost passes.

plural of rudderhole

(nautical) The shank of a rudder, having the blade at one end and the attachments for operating it at the other.