tetraanionic

The story

1. Proto-Indo-European*kʷetwóres
2. Proto-Hellenic*kʷétwores
3. Ancient Greekτέσσᾰρες (téssăres)
4. Ancient Greekτετρᾰ- (tetră-)
5. Englishtetra-
6. Proto-Indo-European*h₂en-
7. Proto-Hellenic*aná
8. Ancient Greekᾰ̓νᾰ́ (ănắ)
9. Ancient Greekᾰ̓νᾰ- (ănă-)
10. Proto-Indo-European*h₁ey-
11. Proto-Indo-European*h₁éyti
12. Proto-Hellenic*éimi
13. Ancient Greekῐ̓όν (ĭón)
14. Ancient Greekἀνῐόν (anĭón)
15. Englishanion
16. Englishanionic
17. English todaytetraanionic

From tetra- + anionic.