the main trunk of the system of tubes by which air passes to and from the lungs in vertebrates; the windpipe
any of the small tubes carrying air through the bodies of most insects and many other arthropods
a vessel in a plant conveying water and nutrients
tracheal /ʹtrayki·əl, trəʹkee·əl/ adj
tracheate /ʹtrayki·ət, -ayt, ʹtrak-/ adj
[Middle English via late Latin from Greek tracheia (artēria) rough (artery), from fem of trachys rough]