Etymology

sigmoidal

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Today it means: sigmoid; S-shaped. Full definition →

Proto-Indo-European *h₂élisder.? ← English sigmoid ← Ancient Greek σῑγμοειδής (sīgmoeidḗs)
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The story

  1. Ancient Greekσῖγμᾰ (sîgmă)
  2. Proto-Indo-European*weyd-
  3. Proto-Indo-European*wéydos
  4. Proto-Hellenic*wéidos
  5. Ancient Greekεἶδος (eîdos)
  6. Ancient Greekσῑγμοειδής (sīgmoeidḗs)
  7. Englishsigmoid
  8. Proto-Indo-European*h₂el-
  9. Proto-Indo-European*h₂élisder.?
  10. English todaysigmoidal

From sigmoid + -al.

Etymology from Wiktionary, CC BY-SA 4.0.