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Webster's 1913 Dictionary

DIPHTHONGIZE

DIPHTHONGIZE Diph "thong *ize, v. t. & i.

Defn: To change into a diphthong, as by affixing another vowel to a simple vowel. "The diphthongized long vowels." H. Sweet.

New American Oxford Dictionary

diphthongize

diph thong ize |ˈdifTHäNGˌgīz, dip-, -THôNG -ˈdɪpθɔŋ (ɡ )ˌaɪz ˈdɪfθɔŋ (ɡ )ˌaɪz | ▶verb [ with obj. ] change (a vowel ) into a diphthong. DERIVATIVES diph thong i za tion |ˌdifTHäNGgəˈzāSHən, ˌdip-, -THôNG - |noun

Oxford Dictionary

diphthongize

diphthongize |ˈdɪfθɒŋʌɪz, ˈdɪp - |(also diphthongise ) ▶verb [ with obj. ] change (a vowel ) into a diphthong. DERIVATIVES diphthongization |-ˈzeɪʃ (ə )n |noun