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