DIPHTHONGIZE Meaning of DIPHTHONGIZE in English diphthongiz|e BrE AmE ˈdɪf θɒŋ ɡaɪz ˈdɪp-, -aɪz AmE \ -θɔːŋ aɪz -θɑːŋ-, -ɡaɪz ▷ diphthongiz|ed d▷ diphthongiz|es ɪz əz ▷ diphthongiz|ing ɪŋ Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012