An"nu*lus (#), n.; pl. Annuli (#). [L.]


A ring; a ringlike part or space.

2. Geom. (a)

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


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

3. Zool.

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


© Webster 1913.

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