downwash

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

Origin:
1910–15; down1 + wash

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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
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Example sentences
It provides a better estimation of building downwash effects by considering building orientation.
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