Etymology

diphthongal

diph·thong·al
D2I1P3H4T1H4O1N1G2A1L1

Today it means: Pertaining to or characterized by a diphthong. Full definition →

Proto-Indo-European *h₂élisder.? ← English diphthong ← French diphtongue
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The story

  1. Proto-Indo-European*dwóh₁
  2. Proto-Indo-European*dwi-
  3. Proto-Hellenic*dwi-
  4. Ancient Greekδι- (di-)
  5. Ancient Greekφθέγγομαι (phthéngomai)
  6. Ancient Greekφθόγγος (phthóngos)
  7. Ancient Greekδίφθογγος (díphthongos)
  8. Latindiphthongu
  9. Frenchdiphtongue
  10. Englishdiphthong
  11. Proto-Indo-European*h₂el-
  12. Proto-Indo-European*h₂élisder.?
  13. English todaydiphthongal

From diphthong + -al.

Etymology from Wiktionary, CC BY-SA 4.0.