A membrane.
A wheelrim.
An edge around something, especially when circular.
A semicircular copydesk.
To form a rim on.
To roll around a rim.
To lick the anus of a partner as a sexual act.
To follow the contours, possibly creating a circuit.
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.