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annuli annulus的復數形 annulus的復數形 Annulus \An"nu*lus\, n.; pl. {Annuli}. [L.]
1. A ring; a ringlike part or space. [1913 Webster] 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. [1913 Webster] 3. (Zool.) Ring-shaped structures or markings, found in, or upon, various animals. [1913 Webster]
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