Rudder :: Rudder (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..
Rudder :: Rudder (n.) Fig.: That which resembles a rudder as a guide or governor; that which guides or governs the course.
Rudderhead :: Rudderhead (n.) The upper end of the rudderpost, to which the tiller is attached..
Rudderhole :: Rudderhole (n.) The hole in the deck through which the rudderpost passes.