nonsteroid

The story

1. Proto-Indo-European*né
2. Proto-Germanic*ne
3. Proto-Indo-European*ís?
4. Proto-Indo-European*h₁óynos
5. Proto-Germanic*ainaz
6. Proto-Germanic*nainaz
7. Proto-West Germanic*nain
8. Old Englishnān
9. Middle Englishnon
10. Old Englishnān
11. Old Englishnān-
12. Middle Englishnon-
13. Englishnon-
14. Proto-Indo-European*ǵʰelh₃-
15. Proto-Hellenic*kʰolā́
16. Ancient Greekχολή (kholḗ)
17. Proto-Indo-European*ster-
18. Ancient Greekστερεός (stereós)
19. Frenchcholestérine
20. Frenchcholestéro
21. Englishcholesterol
22. Englishsterol
23. Proto-Indo-European*weyd-
24. Proto-Indo-European*wéydos
25. Proto-Hellenic*wéidos
26. Ancient Greekεἶδος (eîdos)
27. Englishsteroid
28. English todaynonsteroid

From non- + steroid.