boundary layer boundary condition • boundary line · · · Info · Definitions · Characters · · boundary layer · · Text Common · · Latin · · Scripts 14 · · Length 5 · · Syllables Definitions · · · (noun) the layer of slower flow of a fluid past a surface. Synonyms: boundary layer. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 u latin small letter u U+0075 y latin small letter y U+0079