Etymology

cycloidal

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Today it means: pertaining to or resembling a cycloid, or a circle. Full definition →

Proto-Indo-European *h₂élisder.? ← English cycloid
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The story

  1. Englishcycloid
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todaycycloidal

From cycloid + -al.

Etymology from Wiktionary, CC BY-SA 4.0.