sound unit sound truck • sound wave · · · Info · Definitions · Characters · · sound unit · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) any acoustic unit of measurement. Synonyms: sound unit. · · Noun Definition 1 Characters · · space U+0020 d latin small letter d U+0064 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075