rudder rudder

noun

( ) a hinged vertical airfoil mounted at the tail of an aircraft and used to make horizontal course changes  ( rudder )
a hinged vertical airfoil mounted at the tail of an aircraft and used to make horizontal course changes

(nautical) steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel  ( rudder )
(nautical) steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel