postsurgically

The story

1. Proto-Indo-European*pós
2. Proto-Indo-European*pósti
3. Proto-Italic*posti
4. Old Latinposte
5. Latinpost
6. Englishpost-
7. Proto-Indo-European*ǵʰes-
8. Proto-Indo-European*ǵʰésōr
9. Proto-Hellenic*kʰéhər
10. Ancient Greekχείρ (kheír)
11. Proto-Indo-European*werǵ-
12. Proto-Indo-European*worǵós
13. Proto-Hellenic*worgós
14. Ancient Greekχειρουργός (kheirourgós)
15. Ancient Greekχειρουργῐκός (kheirourgĭkós)
16. Late Latinchīrurgicus
17. Proto-Indo-European*h₂el-
18. Proto-Indo-European*h₂élisder.?
19. Medieval Latincirurgicālis
20. Middle Frenchcirurgica
21. Middle Englishcirurgical
22. Englishsurgical
23. Englishpostsurgical
24. Proto-Indo-European*leyg-
25. Proto-Germanic*līką
26. English todaypostsurgically

From postsurgical + -ly.