- (n.) A ring; a ringlike part or space.
- (n.) A space contained between the circumferences of two circles, one within the other.
- (n.) Ring-shaped structures or markings, found in or upon, various animals.
- (n.) The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). annulus. Retrieved September 20, 2026, from http://smartdefine.org/annulus/definitions/1974106 |
| Chicago | Webster's. 2011. "annulus" http://smartdefine.org/annulus/definitions/1974106 (accessed September 20, 2026). |
| Harvard | Webster's 2011, annulus, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/annulus/definitions/1974106>. |
| MLA | Webster's. "annulus" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/annulus/definitions/1974106> |