- diphthongise (Brit.) v. (Grammar) change from a simple vowel to a diphthong (also diphthongize)
English contemporary dictionary. 2014.
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diphthongise — [c]/ˈdɪfθɒŋaɪz/ (say difthonguyz), / θɒŋgaɪz/ (say thongguyz) verb (diphthongised, diphthongising) –verb (t) 1. to change into or pronounce as a diphthong. –verb (i) 2. to become a diphthong. Also, diphthongize. –diphthongisation… … Australian English dictionary