Annulus

1.

រូបរាងដូចកង

1.

A ring; a ringlike part or space.

2.

A space contained between the circumferences of two circles, one within the other.

3.

The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.

4.

Ring-shaped structures or markings, found in, or upon, various animals.