- a brake or system of brakes operated by compressed air.
- a device for reducing the air speed of an aircraft by increasing its drag.
- a device for stopping the sails of a windmill by disrupting the flow of air around them.
- a brake operated by compressed air, esp in heavy vehicles and trains
- an articulated flap or small parachute for reducing the speed of an aircraft
- a rotary fan or propeller connected to a shaft to reduce its speed
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