pseudopolyanion

The story

1. Ancient Greekψεύδω (pseúdō)
2. Ancient Greekψευδής (pseudḗs)
3. Middle Englishpseudo-
4. Englishpseudo-
5. Proto-Indo-European*pleh₁-
6. Proto-Indo-European*polh₁ús
7. Ancient Greekπολῠ́ς (polŭ́s)
8. Englishpoly-
9. Proto-Indo-European*h₂en-
10. Proto-Hellenic*aná
11. Ancient Greekᾰ̓νᾰ́ (ănắ)
12. Ancient Greekᾰ̓νᾰ- (ănă-)
13. Proto-Indo-European*h₁ey-
14. Proto-Indo-European*h₁éyti
15. Proto-Hellenic*éimi
16. Ancient Greekῐ̓όν (ĭón)
17. Ancient Greekἀνῐόν (anĭón)
18. Englishanion
19. Englishpolyanion
20. English todaypseudopolyanion

From pseudo- + polyanion.