diphthong diphtherotoxin • diphthongal · · · Info · Definitions · Characters · · diphthong · · Text Latin · · Script 9 · · Length 2 · · Syllables Definitions · · · (noun) a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another. · · Noun Definition 1 Characters · · d latin small letter d U+0064 g latin small letter g U+0067 h latin small letter h U+0068 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 t latin small letter t U+0074