American English

Definition of triphthong noun from the Oxford Advanced American Dictionary

 

triphthong

 noun
noun
NAmE//ˈtrɪfθɔŋ//
 
, NAmE//ˈtrɪfθɑŋ//
 
, NAmE//ˈtrɪpθɔŋ//
 
, NAmE//ˈtrɪpθɑŋ//
 
(phonetics)
 
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a combination of three vowel sounds or vowel letters, for example the sounds/aɪə/ in fire/faɪə/ compare diphthong, monophthong
triphthongal
 
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NAmE//trɪfˈθɔŋɡl//
 
, NAmE//trɪfˈθɑŋɡl//
 
, NAmE//trɪpˈθɔŋɡl//
 
, NAmE//trɪpˈθɑŋɡl//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: triphthong