The story
- Proto-Indo-European*h₁én
- Proto-Indo-European*h₁énteros
- Latin*interus
- Latinintrā
- Englishintra-
- Proto-Indo-European*dʰreh₂gʰ-
- Proto-Indo-European*dʰréh₂gʰus
- Proto-Hellenic*tʰrākʰús
- Ancient Greekτρᾱχεῖᾰ (trākheîă)
- Late Latintrāchīa
- Medieval Latintrāchēa
- Englishtrachea
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishtracheal
- Englishintratracheal
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- English todayintratracheally
From intratracheal + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.