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Definition of: annulus
(an′yə·ləs) noun plural ·li (-lī) or ·lus·es
1. A ringlike body or figure.
2. Geom. The area between the circumferences of two concentric circles.
3. Astron. The thin, visible edge of the sun's disk as it appears around the body of the moon in an annular eclipse. [ < L, a ring]
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