otosurgical

The story

1. Proto-Indo-European*h₂ew-
2. Proto-Indo-European*h₂ṓws
3. Ancient Greekοὖς (oûs)
4. Ancient Greekὠτ- (ōt-)
5. Englishot-
6. Englishoto-
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. English todayotosurgical

From oto- + surgical.