![](/media/cache/3c/b3/3cb3d4d7a0bfaa5033be31cf08c68c9a.jpg)
Follow
diphthong /ˈdifˌTHäNG/ /ˈdipˌTHäNG/
Noun. Late Middle English: from French diphtongue, via late Latin from Greek diphthongos, from di- 'twice' + phthongos 'voice, sound'. A sound formed by the combination of two vowels in a single syllable, in which the sound begins as one vowel and moves toward another. -- Oxford English Dictionary