neurosteroidogenesis

The story

1. Proto-Indo-European*(s)neh₁-
2. Proto-Indo-European*snéh₁wr̥
3. Ancient Greekνεῦρον (neûron)
4. Ancient Greekνευρο- (neuro-)
5. Englishneuro-
6. Proto-Indo-European*ǵʰelh₃-
7. Proto-Hellenic*kʰolā́
8. Ancient Greekχολή (kholḗ)
9. Proto-Indo-European*ster-
10. Ancient Greekστερεός (stereós)
11. Frenchcholestérine
12. Frenchcholestéro
13. Englishcholesterol
14. Englishsterol
15. Proto-Indo-European*weyd-
16. Proto-Indo-European*wéydos
17. Proto-Hellenic*wéidos
18. Ancient Greekεἶδος (eîdos)
19. Englishsteroid
20. Englishneurosteroid
21. Proto-Indo-European*ǵenh₁-
22. Proto-Indo-European*ǵénh₁tis
23. Proto-Hellenic*génetis
24. Ancient Greekγένεσῐς (génesĭs)
25. English todayneurosteroidogenesis

From neurosteroid + -o- + -genesis.