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Meaning of surface boundary layer

sur'face bound'ary lay"er

Pronunciation: [key]
— Meteorol. Meteorol.
  1. the thin layer of air adjacent to the earth's surface, usually considered to be less than 300 ft. (91 m) high. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.