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English definition of “triphthong”

triphthong

noun [C] uk   /ˈtrɪf.θɒŋ/ /ˈtrɪp-/ us    /-θɑːŋ/ specialized
a vowel sound in which the tongue changes position to produce the sound of three vowels
(Definition of triphthong from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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