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diphthongize


(also diphthongise)
Definition of diphthongize

verb

[with object]
  • change (a vowel) into a diphthong: the short vowel was not lengthened or diphthongized

Derivatives

diphthongization

Pronunciation: /-ˈzeɪʃ(ə)n/

noun

diphthongize in other Oxford dictionaries

Definition of diphthongize in the US English dictionary