girdle

That which girds, encircles, or encloses; a circumference

A belt or elasticated corset; especially, a belt, sash, or article of dress encircling the body usually at the waist, often used to support stockings or hosiery.

The zodiac; also, the equator.

The line of greatest circumference of a brilliant-cut diamond, at which it is grasped by the setting.

A thin bed or stratum of stone.

The clitellum of an earthworm.

The removal or inversion of a ring of bark in order to kill or stunt a tree.