1) Constraint 2) Dive brake 3) Invention of 1868 4) Plane device 5) Restraint 
An aerodynamic control which can be extended to increase drag and slow down an aircraft
[n] - a small parachute or articulated flap to reduce the speed of an aircraft 2. [n] - a vehicular brake that operates by compressed air
An aerodynamic control which can be extended to increase drag and slow down an aircraft. See also: Aerofoil.
noun a small parachute or articulated flap to reduce the speed of an aircraft noun a vehicular brake that operates by compressed air; especially for heavy vehicles