air-brake

air brake

noun
1.
a brake or system of brakes operated by compressed air.
2.
Aeronautics. a device for reducing the air speed of an aircraft by increasing its drag.
3.
a device for stopping the sails of a windmill by disrupting the flow of air around them.

Origin:
1870–75, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
air brake
 
n
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

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