deoxidize

The story

1. Proto-Indo-European*de
2. Proto-Indo-European*déh₁
3. Proto-Italic*dē
4. Latindē
5. Latindē-
6. Englishde-
7. Proto-Indo-European*h₂eḱ-der.?
8. Ancient Greekὀξύς (oxús)
9. Proto-Indo-European*ǵenh₁-
10. Proto-Indo-European*ǵénh₁os
11. Proto-Hellenic*génos
12. Ancient Greekγένος (génos)
13. Frenchoxygène
14. Proto-Indo-European*h₂eḱ-
15. Proto-Indo-European*h₂eḱéh₁yeti
16. Proto-Italic*akēō
17. Latinaceō
18. Proto-Indo-European*dʰeh₁-
19. Latinacidu
20. Frenchacide
21. Frenchoxide
22. Englishoxide
23. Englishoxidize
24. English todaydeoxidize

From de- + oxidize.