apotracheal

The story

1. Proto-Indo-European*h₂ep
2. Proto-Indo-European*h₂epó
3. Proto-Hellenic*apó
4. Ancient Greekᾰ̓πό (ăpó)
5. Ancient Greekᾰ̓πο- (ăpo-)
6. Englishapo-
7. Proto-Indo-European*dʰreh₂gʰ-
8. Proto-Indo-European*dʰréh₂gʰus
9. Proto-Hellenic*tʰrākʰús
10. Ancient Greekτρᾱχεῖᾰ (trākheîă)
11. Late Latintrāchīa
12. Medieval Latintrāchēa
13. Englishtrachea
14. Proto-Indo-European*h₂el-
15. Proto-Indo-European*h₂élisder.?
16. Englishtracheal
17. English todayapotracheal

From apo- + tracheal.