Definition of surface boundary layer in English:

surface boundary layer

Syllabification: sur·face bound·a·ry lay·er

Entry from US English dictionary

noun

Meteorology
  • The lowest layer of the earth’s atmosphere extending to about one kilometer. Winds within it are affected by friction with the earth’s surface.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space