extrasurgical

The story

1. Proto-Indo-European*h₁éǵʰ
2. Proto-Indo-European*h₁éǵʰs
3. Proto-Indo-European*h₁eǵʰsteros
4. Proto-Italic*eksteros
5. Latinexter
6. Latinextrā
7. Englishextra-
8. Proto-Indo-European*ǵʰes-
9. Proto-Indo-European*ǵʰésōr
10. Proto-Hellenic*kʰéhər
11. Ancient Greekχείρ (kheír)
12. Proto-Indo-European*werǵ-
13. Proto-Indo-European*worǵós
14. Proto-Hellenic*worgós
15. Ancient Greekχειρουργός (kheirourgós)
16. Ancient Greekχειρουργῐκός (kheirourgĭkós)
17. Late Latinchīrurgicus
18. Proto-Indo-European*h₂el-
19. Proto-Indo-European*h₂élisder.?
20. Medieval Latincirurgicālis
21. Middle Frenchcirurgica
22. Middle Englishcirurgical
23. Englishsurgical
24. English todayextrasurgical

From extra- + surgical.