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English definition of “triphthong”

triphthong

noun [C]     /ˈtrɪf.θɒŋ/ /ˈtrɪp-/ US  /-θɑːŋ/ specialized
a vowel sound in which the tongue changes position to produce the sound of three vowels → Compare diphthong, monophthong
(Definition of triphthong noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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