midtracheal

The story

1. Proto-Indo-European*me
2. Proto-Indo-European*dʰeh₁-?
3. Proto-Indo-European*médʰi
4. Proto-Indo-European*médʰyos
5. Proto-Germanic*midjaz
6. Proto-West Germanic*midi
7. Old Englishmidd
8. Middle Englishmid
9. Englishmid
10. Englishmid-
11. Proto-Indo-European*dʰreh₂gʰ-
12. Proto-Indo-European*dʰréh₂gʰus
13. Proto-Hellenic*tʰrākʰús
14. Ancient Greekτρᾱχεῖᾰ (trākheîă)
15. Late Latintrāchīa
16. Medieval Latintrāchēa
17. Englishtrachea
18. Proto-Indo-European*h₂el-
19. Proto-Indo-European*h₂élisder.?
20. Englishtracheal
21. English todaymidtracheal

From mid- + tracheal.