A tube, a pipe, or a hole.
An abnormal connection or passageway between organs or vessels that normally do not connect.
The tube through which the wine of the Eucharist was once sucked from the chalice in certain ceremonies (such as papal Masses).
a length of tube, or a system of tubes
tubes, considered as a group
the recreation of riding down a river on an inner tube
the recreation of tobogganing down a snowy slope or toboggan run on an inner tube