antisteroid

The story

1. Proto-Indo-European*h₂ent-
2. Proto-Indo-European*h₂énts
3. Proto-Indo-European*h₂énti
4. Ancient Greekᾰ̓ντῐ́ (ăntĭ́)
5. Ancient Greekἀντι- (anti-)
6. Englishanti-
7. Proto-Indo-European*ǵʰelh₃-
8. Proto-Hellenic*kʰolā́
9. Ancient Greekχολή (kholḗ)
10. Proto-Indo-European*ster-
11. Ancient Greekστερεός (stereós)
12. Frenchcholestérine
13. Frenchcholestéro
14. Englishcholesterol
15. Englishsterol
16. Proto-Indo-European*weyd-
17. Proto-Indo-European*wéydos
18. Proto-Hellenic*wéidos
19. Ancient Greekεἶδος (eîdos)
20. Englishsteroid
21. English todayantisteroid

From anti- + steroid.