passive transport passive source • passive trust · · · Info · Definitions · Characters · · passive transport · · Text Common · · Latin · · Scripts 17 · · Length 4 · · Syllables Definitions · · · (noun) transport of a substance across a cell membrane by diffusion; expenditure of energy is not required. Synonyms: passive transport. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 v latin small letter v U+0076