Webster's English Dictionary

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trachea

tra.chea \'tra--ke--*\ \-ke--.e-, -ke--.i-\ n or tra.che.ae also tra.che.as 
   [ME, fr. ML, fr. LL trachia, fr. Gk tracheia (arte-ria) ro] [NL, fr. ML] 
   [NL] pl ugh (artery), fr. fem. of trachys rough; akin to Gk thrassein to 
   trouble - more at DARK 1: the main trunk of the system of tubes by which 
   air passes to and from th e lungs in vertebrates 2: a xylem element or 
   series of elements felt to resemble an animal trachea  3: one of the 
   air-conveying tubules forming the respiratory system of most  insects and 
   many other arthropods