diphthongize Syllabification: (diph·thong·ize)Pronunciation: /ˈdifTHäNGˌgīz, dip-, -THôNG-/Definition of diphthongize verb [with object] change (a vowel) into a diphthong. Derivatives diphthongizationPronunciation: /ˌdifTHäNGgəˈzāSHən, ˌdip-, -THôNG-/ noun diphthongize in other Oxford dictionaries Definition of diphthongize in the British & World English dictionary
