decaoxide

The story

1. Proto-Indo-European*déḱm̥
2. Proto-Hellenic*dékə
3. Ancient Greekδέκᾰ (dékă)
4. Ancient Greekδεκάς (dekás)
5. Late Latindecas
6. Frenchdéca-
7. Englishdeca-
8. Proto-Indo-European*h₂eḱ-der.?
9. Ancient Greekὀξύς (oxús)
10. Proto-Indo-European*ǵenh₁-
11. Proto-Indo-European*ǵénh₁os
12. Proto-Hellenic*génos
13. Ancient Greekγένος (génos)
14. Frenchoxygène
15. Latinacidu
16. Frenchacide
17. Frenchoxide
18. Englishoxide
19. English todaydecaoxide

From deca- + oxide.