Aeronautics. A flat, hinged structure used in steering an aircraft; (now esp.) a vertical flap on the tail of an aeroplane, used in altering its…

(a) the tail of a crustacean; (b) Aeronautics an adjustable control surface on the tail of an aircraft.

Applied to various mechanical contrivances, or artificial structures, of which the whole or the main part works or lies in a horizontal direction.

Aeronautics. A control surface of an aeroplane (now always on the tailplane) used to change its angle of pitch.

A control surface which performs the functions of both a rudder and an elevator.

A horizontal control surface on an aircraft which can function as both elevator and aileron, moving either in unison with its partner or in…