A hinged vertical airfoil mounted at the tail of an aircraft and used to make horizontal course changes.

Roget 693: direction; management, managery^†; government, gubernation^†, conduct, legislation, regulation, guidance; bossism [U.S.]; legislature; steerage, pilotage; reins, reins of government; helm, rudder, needle, compass; guiding star, load star, lode star, pole star; cynosure.    supervision, superintendence; surveillance, oversight; eye of the master; control, charge; board of control etc. (council) 696; command etc. (authority) 737.    premiership, senatorship; director etc. 694; chair, portfolio.    statesmanship; statecraft, kingcraft^†, queencraft^†.    ministry, ministration; administration; stewardship, proctorship^†; agency.    [person who directs] director etc. 694.    ... show more

Dutch: richtingsroer, stuurroer

nautical Steering mechanism consisting of a hinged vertical plate mounted at the stern of a vessel.

Dutch: roer