paratracheal

The story

1. Proto-Indo-European*per-
2. Proto-Indo-European*preh₂-
3. Proto-Hellenic*pərai
4. Ancient Greekπᾰρᾰ́ (părắ)
5. Ancient Greekπᾰρᾰ- (pără-)
6. Englishpara-
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 todayparatracheal

From para- + tracheal.