Etymology

ellipsoidal

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Today it means: Of or pertaining to an ellipsoid. Full definition →

Proto-Indo-European *h₂élisder.? ← English ellipsoid ← Ancient Greek εἶδος (eîdos)
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The story

  1. Englishellipse
  2. Proto-Indo-European*weyd-
  3. Proto-Indo-European*wéydos
  4. Proto-Hellenic*wéidos
  5. Ancient Greekεἶδος (eîdos)
  6. Englishellipsoid
  7. Proto-Indo-European*h₂el-
  8. Proto-Indo-European*h₂élisder.?
  9. English todayellipsoidal

From ellipsoid + -al.

Etymology from Wiktionary, CC BY-SA 4.0.