Etymology

diphthongisation

English diphthong ← French diphtongue ← Latin diphthongu
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The story

  1. Latindiphthongu
  2. Frenchdiphtongue
  3. Englishdiphthong
  4. English todaydiphthongisation

From diphthong + -isation.

Etymology from Wiktionary, CC BY-SA 4.0.