secosteroidogenesis

The story

1. Proto-Indo-European*sek-
2. Proto-Indo-European*sékh₁yeti
3. Proto-Italic*sekaō
4. Latinsecō
5. Proto-Indo-European*ǵʰelh₃-
6. Proto-Hellenic*kʰolā́
7. Ancient Greekχολή (kholḗ)
8. Proto-Indo-European*ster-
9. Ancient Greekστερεός (stereós)
10. Frenchcholestérine
11. Frenchcholestéro
12. Englishcholesterol
13. Englishsterol
14. Proto-Indo-European*weyd-
15. Proto-Indo-European*wéydos
16. Proto-Hellenic*wéidos
17. Ancient Greekεἶδος (eîdos)
18. Englishsteroid
19. Englishsecosteroid
20. Proto-Indo-European*ǵenh₁-
21. Proto-Indo-European*ǵénh₁tis
22. Proto-Hellenic*génetis
23. Ancient Greekγένεσῐς (génesĭs)
24. English todaysecosteroidogenesis

From secosteroid + -o- + -genesis.