/ Thesaurus / B Synonyms of boundary layer Find synonyms for: Noun1. boundary layer, physical phenomenonusage: the layer of slower flow of a fluid past a surfaceWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: devout Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language