How do you spell Annulus
Available Definitions:
1) n. - A ring; a ringlike part or space.
2) n. - A space contained between the circumferences of two circles, one within the other.
3) n. - The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
4) n. - Ring-shaped structures or markings, found in, or upon, various animals.
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