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friction layer

surface boundary layer

noun, Meteorology
1.
the thin layer of air adjacent to the earth's surface, usually considered to be less than 300 feet (91 meters) high.
Also called surface layer, atmospheric boundary layer, friction layer, ground layer.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for friction-layer

friction layer

noun
1.
the atmospheric layer extending up to about 600 m, in which the aerodynamic effects of surface friction are appreciable
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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