extratracheal

Etymology tree
Proto-Indo-European *h₁éǵʰ
Proto-Indo-European *-s
Proto-Indo-European *h₁éǵʰs
Proto-Indo-European *-teros
Proto-Indo-European *h₁eǵʰsteros
Proto-Italic *eksteros
Latin exter
Latin extrā
English extra-
Proto-Indo-European *dʰreh₂gʰ-
Proto-Indo-European *dʰréh₂gʰ-us
Proto-Hellenic *tʰrākʰús
Ancient Greek τρᾱχεῖᾰ (trākheîă)bor.
Late Latin trāchīa
Medieval Latin trāchēader.
Middle English
English trachea
Proto-Indo-European *h₂el-der.?
Proto-Italic *-ālis
Latin -ālisbor.
Old French -albor.
▲
Latin -ālis
Old French -elbor.
▲
Latin -ālisbor.
Middle English -al
English -al
English tracheal
English extratracheal
From extra- + tracheal.