Etymology

cycloheptatriene

Today it means: A cycloalkene having a seven-membered ring and three double bonds; removal of a hydride ion produces the aromatic tropylium ion Full definition →

English heptatriene ← Classical Latin cyclicus ← French cyclique
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The story

  1. Proto-Indo-European*kʷelh₁-redup.
  2. Proto-Indo-European*kʷékʷlos
  3. Proto-Hellenic*kʷókʷlos
  4. Proto-Hellenic*kúklos
  5. Ancient Greekκύκλος (kúklos)
  6. Late Latincyclus
  7. Middle Englishcicle
  8. Englishcycle
  9. Ancient Greekκύκλος (kúklos)
  10. Ancient Greekκυκλῐκός (kuklĭkós)
  11. Classical Latincyclicu
  12. Middle Frenchcyclique
  13. Frenchcyclique
  14. Classical Latincyclicus
  15. Englishcyclic
  16. Englishcyclo-
  17. Englishheptatriene
  18. English todaycycloheptatriene

From cyclo- + heptatriene.

Etymology from Wiktionary, CC BY-SA 4.0.