Origin: OE. Rother, AS. Rother a paddle; akin to D. Roer rudder, oar, G. Ruder, OHG. Roadar, Sw. Roder, ror, Dan. Roer, ror.
See row to propel with an oar, and cf. Rother.
1. 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.
2. That which resembles a rudder as a guide or governor; that which guides or governs the course. For rhyme the rudder is of verses. (Hudibras) balance rudder, ropes connected with the rudder chains.