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downwashes

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down⋅wash

[doun-wosh, -wawsh]
–noun Aeronautics.
a deflection of air downward relative to an airfoil that causes the deflection.

Origin:
1910–15; down 1 + wash
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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down·wash   (doun'wŏsh', -wôsh')   
n.  Downward air turbulence caused by the motion or action of a propeller or jet: the downwash of the helicopter blades.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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