Annulus

Definition:

(n.) A ring; a ringlike part or space.
(n.) A space contained between the circumferences of two circles, one within the other.
(n.) The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
(n.) Ring-shaped structures or markings, found in, or upon, various animals.

Compare annulus with other words:

annuli vs. annulus

annular vs. annulus

annulus vs. fern

annulus vs. sun

annulus vs. moon

annulus vs. radius

annulus vs. circle

annulus vs. plane

annulus vs. region

annulus vs. structure

annulus vs. area

annulus vs. torus

annulus vs. ring