Etymology

spirocyclopentane

Today it means: A divalent radical in which a cyclopentane ring is fused to another ring at a single carbon atom, the two rings being more-or-less at right angles to one another Full definition →

English cyclopentane ← Latin spīra ← Ancient Greek σπεῖρα (speîra)
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The story

  1. Proto-Indo-European*sper-
  2. Proto-Indo-European*sper-yeh₂-
  3. Ancient Greekσπεῖρα (speîra)
  4. Latinspīra
  5. Englishspiro-
  6. Englishcyclopentane
  7. English todayspirocyclopentane

From spiro- + cyclopentane.

Etymology from Wiktionary, CC BY-SA 4.0.