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surface boundary layer

American  

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.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.