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

 

diphthongization

 noun
(British English also -isation)noun
BrE BrE//ˌdɪfθɒŋaɪˈzeɪʃn//
 
; NAmE NAmE//ˌdɪfθɑːŋəˈzeɪʃn//
 
, NAmE//ˌdɪfθɔːŋəˈzeɪʃn//
 
, NAmE//ˌdɪpθɑːŋəˈzeɪʃn//
 
, NAmE//ˌdɪpθɔːŋəˈzeɪʃn//
 
[uncountable]
 
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(phonetics) the act of changing a vowel into a diphthong