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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 of air brake
1870-1875
An Americanism dating back to 1870-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for air brake

air brake

noun
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for air

3
3
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