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wind shear

[wind] /wɪnd/
noun
1.
the rate at which wind velocity changes from point to point in a given direction.
2.
a condition, dangerous to aircraft, in which the speed or direction of the wind changes abruptly.
Compare microburst.
Origin
1940-1945
1940-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for wind shear

wind shear

/wɪnd/
noun
1.
stress on an aircraft in an area in which winds of different speeds and directions are close together
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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wind shear in Science
wind shear  
A change in wind direction and speed between slightly different altitudes, especially a sudden downdraft. Depending on its scale, wind shear can cause a variety of effects, from minor turbulence to tornadoes. Wind shear caused by interactions between oceanic and atmospheric winds can be so strong that it can dissipate hurricanes. See also shear force.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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