oncosurgical

The story

1. Ancient Greekὄγκος (ónkos)
2. New Latinonco-
3. Englishonco-
4. Proto-Indo-European*ǵʰes-
5. Proto-Indo-European*ǵʰésōr
6. Proto-Hellenic*kʰéhər
7. Ancient Greekχείρ (kheír)
8. Proto-Indo-European*werǵ-
9. Proto-Indo-European*worǵós
10. Proto-Hellenic*worgós
11. Ancient Greekχειρουργός (kheirourgós)
12. Ancient Greekχειρουργῐκός (kheirourgĭkós)
13. Late Latinchīrurgicus
14. Proto-Indo-European*h₂el-
15. Proto-Indo-European*h₂élisder.?
16. Medieval Latincirurgicālis
17. Middle Frenchcirurgica
18. Middle Englishcirurgical
19. Englishsurgical
20. English todayoncosurgical

From onco- + surgical.