Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of annulus is as below...

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

Annulus :: Annulus (n.) A space contained between the circumferences of two circles, one within the other..

Annulus :: Annulus (n.) A ring; a ringlike part or space.

Capstone :: Capstone (n.) A fossil echinus of the genus Cannulus; -- so called from its supposed resemblance to a cap.

Annulus :: Annulus (n.) Ring-shaped structures or markings, found in, or upon, various animals..

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