| 单词 | annulus |
| 释义 | annulus [`an·yǝ·lǝs] ANATOMY Any ringlike anatomical part. BOTANY 1. An elastic ring of cells between the operculum and the mouth of the capsule in mosses. 2. A line of cells, partly or entirely surrounding the sporangium in ferns, which constricts, thus causing rupture of the sporangium to release spores. 3. A whorl resembling a calyx at the base of the strobilus in certain horsetails. MATHEMATICS The ringlike figure that lies between two concentric circles. MYCOLOGY A ring of tissue representing the remnant of the veil around the stipe of some agarics. |
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