Definition of triphthong noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈtrɪfθɒŋ//
; NAmE NAmE//ˈtrɪfθɔːŋ//
; BrE BrE//ˈtrɪpθɒŋ//
; NAmE NAmE//ˈtrɪpθɔːŋ//
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a combination of three vowel sounds or vowel letters, for example the sounds /aɪə/ in fire /faɪə(r)/ compare diphthong, monophthong Word Originmid 16th cent.: from French triphtongue, from tri- ‘three’, on the pattern of diphthong.
See the Oxford Advanced American Dictionary entry: triphthong