Meaning of “diphthong” in the English Dictionary

british dictionary

"diphthong" in British English

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diphthongnoun [ C ]

uk /ˈdɪf.θɒŋ/ /ˈdɪp.θɒŋ/ us /ˈdɪf.θɑːŋ/ /ˈdɪp.θɑːŋ/ specialized

a vowel sound in which the tongue changes position to produce the sound of two vowels

(Definition of “diphthong” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)