/ Dictionary / Index A atmospheric boundary layer: Meaning and Definition of Find definitions for: at'mospher'ic bound'ary lay"er. Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. atmospheric atmospheric braking Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language