Either of the ringlike groups of bones supporting the forelimbs (arms) and hindlimbs (legs) in vertebrates.

1. Either of the hooplike bands constituting the sides of the two valves of a diatom.

2. The peripheral portion of the mantle in chitons.

The periphery of a cut gemstone that is usually grasped by the setting or mounting.

With reference to a fabric diagram or equal- area projection net, a belt showing concentration of points which is approximately coincident with a great circle of the net and which represents orientation of the fabric elements.