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1. A brake, especially on a motor vehicle, that is operated by compressed air.
2. A surface, such as an aileron, that can be projected into the airflow in order to decrease the airspeed of an airplane by increasing drag; a spoiler.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Mechanical Engineering) a brake operated by compressed air, esp in heavy vehicles and trains
2. (Aeronautics) Also called: dive brake an articulated flap or small parachute for reducing the speed of an aircraft
3. (Mechanical Engineering) a rotary fan or propeller connected to a shaft to reduce its speed
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a brake or system of brakes operated by compressed air.
2. a device for reducing the air speed of an aircraft by increasing its drag.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.