annulus

1. n. A ring; a ringlike part or space. Source: opted

2. n. A space contained between the circumferences of two circles, one within the other. Source: opted

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

4. n. Ring-shaped structures or markings, found in, or upon, various animals. Source: opted

5. n. a toroidal shape Source: wordnet

6. n. (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar Source: wordnet

7. 1. A ring; a ringlike part or space. 2. (Geom.) (a) A space contained between the circumferences of two circles, one within the other. (b) The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it. 3. (Zoöl.) ring-shaped">Ring-shaped structures or markings, found in, or upon, various animals. Source: webster

8. Ring-shaped structures or markings, found in, or upon, variousanimals. Source: adambom

9. n:100 n. (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar Source: ecdict

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