Etymology

isoprenyl

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Today it means: The univalent radical -CH₂CH=C(CH₃)₂ (C₅H₉) derived from isoprene (C₅H₈).https://journals.sagepub.com/doi/pdf/10.1177/1934578X0900400115 Also called prenyl. Full definition →

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

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

From isoprene + -yl.

Etymology from Wiktionary, CC BY-SA 4.0.