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 retractable tube fitted in diesel-engine submarines to allow sufficient ventilation that the engines may be used at periscope depth.
A snorkel parka.
A hollow tube, held in the mouth, or mounted on and opening into a diving mask, used by swimmers for breathing underwater.
To use a snorkel.