diph‧thong /ˈdɪfθɒŋ, ˈdɪp- $ -θɒːŋ/ noun [countable] technical
[Date: 1400-1500; Language: French; Origin: Late Latin diphthongus 'two sounds', from Greek phthongos 'voice, sound']
a vowel sound made by pronouncing two vowels quickly one after the other. For example, the vowel sound in ‘main’ is a diphthong.

[TahlilGaran] Dictionary of Contemporary English ▲