Definition of diphthongal adjective from the Oxford Advanced Learner's Dictionary

 

diphthongal

 adjective
adjective
BrE BrE//dɪfˈθɒŋɡl//
 
; NAmE NAmE//dɪfˈθɑːŋɡl//
 
, NAmE//dɪfˈθɔːŋɡl//
 
; BrE BrE//dɪpˈθɒŋɡl//
 
; NAmE NAmE//dɪpˈθɑːŋɡl//
 
, NAmE//dɪpˈθɔːŋɡl//
 
(phonetics)
 
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combining two vowel sounds or vowel letters, for example the sounds // in pipe /paɪp/ or the letters ou in doubt compare monophthongal, triphthongal