air brake

a brake or system of brakes operated by compressed air.
Aeronautics. 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.

1870–75, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
air brake
1.  a brake operated by compressed air, esp in heavy vehicles and trains
2.  Also called: dive brake an articulated flap or small parachute for reducing the speed of an aircraft
3.  a rotary fan or propeller connected to a shaft to reduce its speed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Other new inspection equipment uses computerized vision to look for defects in
  air brake hoses between cars.
Air brake systems need special attention in the winter.
Frozen moisture in an air brake system seriously affects operation.
Also, he received no training on how to drive an air brake-equipped vehicle.
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