oxoanionic

The story

1. Proto-Indo-European*h₂eḱ-der.?
2. Ancient Greekὀξύς (oxús)
3. Proto-Indo-European*ǵenh₁-
4. Proto-Indo-European*ǵénh₁os
5. Proto-Hellenic*génos
6. Ancient Greekγένος (génos)
7. Frenchoxygène
8. Englishoxygen
9. Englishoxo-
10. Proto-Indo-European*h₂en-
11. Proto-Hellenic*aná
12. Ancient Greekᾰ̓νᾰ́ (ănắ)
13. Ancient Greekᾰ̓νᾰ- (ănă-)
14. Proto-Indo-European*h₁ey-
15. Proto-Indo-European*h₁éyti
16. Proto-Hellenic*éimi
17. Ancient Greekῐ̓όν (ĭón)
18. Ancient Greekἀνῐόν (anĭón)
19. Englishanion
20. Englishoxoanion
21. English todayoxoanionic

From oxoanion + -ic.