polyanionic

The story

1. Proto-Indo-European*pleh₁-
2. Proto-Indo-European*polh₁ús
3. Ancient Greekπολῠ́ς (polŭ́s)
4. Englishpoly-
5. Proto-Indo-European*h₂en-
6. Proto-Hellenic*aná
7. Ancient Greekᾰ̓νᾰ́ (ănắ)
8. Ancient Greekᾰ̓νᾰ- (ănă-)
9. Proto-Indo-European*h₁ey-
10. Proto-Indo-European*h₁éyti
11. Proto-Hellenic*éimi
12. Ancient Greekῐ̓όν (ĭón)
13. Ancient Greekἀνῐόν (anĭón)
14. Englishanion
15. Englishanionic
16. English todaypolyanionic

From poly- + anionic.