pneumonectomy

The story

1. Proto-Indo-European*plew-
2. Proto-Indo-European*pléwmō
3. Ancient Greekπλεύμων (pleúmōn)
4. Ancient Greekπνέω (pnéō)influ.
5. Ancient Greekπνεῦμα (pneûma)influ.
6. Ancient Greekπνεύμων (pneúmōn)
7. Englishpneumono-
8. Proto-Indo-European*h₁éǵʰ
9. Proto-Indo-European*h₁eǵʰs
10. Proto-Hellenic*eks
11. Ancient Greekἐκ (ek)
12. Ancient Greekἐκ- (ek-)
13. Proto-Indo-European*temh₁-
14. Ancient Greekτέμνω (témnō)
15. Ancient Greekἐκτέμνω (ektémnō)
16. Ancient Greekἐκτομή (ektomḗ)
17. English todaypneumonectomy

From pneumono- + -ectomy.