Definitions for air brake
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Random House Webster's College Dictionary
air′ brake`(n.)
a brake or system of brakes operated by compressed air.
Category: Machinery
a device for reducing the air speed of an aircraft by increasing its drag.
Category: Aeronautics
Origin of air brake:
1870–75, Amer.
Webster Dictionary
Air brake(u)
a railway brake operated by condensed air
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"air brake." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/air brake>.