esophagotracheal

The story

1. Ancient Greekοἰσοφᾰ́γος (oisophắgos)
2. Englishesophago-
3. Proto-Indo-European*dʰreh₂gʰ-
4. Proto-Indo-European*dʰréh₂gʰus
5. Proto-Hellenic*tʰrākʰús
6. Ancient Greekτρᾱχεῖᾰ (trākheîă)
7. Late Latintrāchīa
8. Medieval Latintrāchēa
9. Englishtrachea
10. Proto-Indo-European*h₂el-
11. Proto-Indo-European*h₂élisder.?
12. Englishtracheal
13. English todayesophagotracheal

From esophago- + tracheal.