snorkel

1. A hollow tube, held in the mouth, or mounted on and opening into a diving mask, used by swimmers for breathing underwater. · They wore snorkels while exploring the coral reef.· She used a snorkel to breathe while swimming underwater.
2. A retractable tube fitted in diesel-engine submarines to allow sufficient ventilation that the engines may be used at periscope depth.
3. A snorkel parka.

الجمع snorkels