Etymology

cyclopentyl

C3Y4C3L1O1P3E1N1T1Y4L1

Today it means: The univalent radical derived from cyclopentane by the formal removal of a hydrogen atom. Full definition →

Ancient Greek ῡ̔́λη (hū́lē) ← Proto-Indo-European *swel-der.? ← English cyclopentane
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The story

  1. Englishcyclopentane
  2. Proto-Indo-European*swel-der.?
  3. Ancient Greekῡ̔́λη (hū́lē)
  4. English todaycyclopentyl

From cyclopentane + -yl.

Etymology from Wiktionary, CC BY-SA 4.0.