mouth organ mouth off • mouthpart · · · Info · Definitions · Synonyms · Characters · · mouth organ · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired hole. Synonyms: harmonica, mouth organ, harp, mouth harp. · · Noun Definition 1 Synonyms · · · harmonica · · Synonym 1 harp · · Synonym 2 mouth harp · · Synonym 3 Characters · · space U+0020 a latin small letter a U+0061 g latin small letter g U+0067 h latin small letter h U+0068 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075