Etymology

helicoidal

H4E1L1I1C3O1I1D2A1L1

Today it means: Synonym of helicoid. Full definition →

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

  1. Englishhelicoid
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todayhelicoidal

From helicoid + -al.

Etymology from Wiktionary, CC BY-SA 4.0.