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

 

triphthong

 noun
noun
BrE BrE//ˈtrɪfθɒŋ//
 
; NAmE NAmE//ˈtrɪfθɔːŋ//
 
; BrE BrE//ˈtrɪpθɒŋ//
 
; NAmE NAmE//ˈtrɪpθɔːŋ//
 
(phonetics)
 
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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 Origin mid 16th cent.: from French triphtongue, from tri- ‘three’, on the pattern of diphthong.
See the Oxford Advanced American Dictionary entry: triphthong