cycloaddition

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. Proto-Indo-European*h₂éd
18. Proto-Italic*ad
19. Proto-Italic*ad-
20. Latinad-
21. Proto-Indo-European*dʰeh₁-
22. Proto-Indo-European*dʰéh₁t
23. Latinaddō
24. Latinadditiō
25. Old Frenchadition
26. Middle Englishaddicioun
27. Englishaddition
28. English todaycycloaddition

From cyclo- + addition.