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diphthong +‎ -ize

Verb edit

diphthongize (third-person singular simple present diphthongizes, present participle diphthongizing, simple past and past participle diphthongized)

  1. (transitive, phonetics) To change to a diphthong, as by inserting or removing a vowel.
    Coordinate term: monophthongize
  2. (intransitive, phonetics) To become a diphthong.

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