downwash

 [doun-wosh, -wawsh]  

down·wash

   [doun-wosh, -wawsh]
noun Aeronautics.
a deflection of air downward relative to an airfoil that causes the deflection.
Origin:
1910–15; down1 + wash
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Downwash is always a great word to know.
So is simple pendulum. Does it mean:
fractional change in body's length due to applied tensile force
apparatus with suspended point mass, frictionless thread, constant length and periodic motion
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Collins
World English Dictionary
downwash (ˈdaʊnˌwɒʃ)
 
—n
the downward deflection of an airflow, esp one caused by an aircraft wing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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