harmonica harmonic • harmonical · · · Info · Definitions · Synonyms · Characters · · harmonica · · Text Latin · · Script 9 · · Length 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: mouth organ, harp, mouth harp. · · Noun Definition 1 Synonyms · · · mouth organ · · Synonym 1 harp · · Synonym 2 mouth harp · · Synonym 3 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 h latin small letter h U+0068 i latin small letter i U+0069 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