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annulus |
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annulus [′an·yə·ləs] (anatomy) Any ringlike anatomical part. (botany) An elastic ring of cells between the operculum and the mouth of the capsule in mosses. A line of cells, partly or entirely surrounding the sporangium in ferns, which constricts, thus causing rupture of the sporangium to release spores. 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Approximately 3 to 5 mm from the annulus in the middle and interior portions of the canal, a trough was palpated. It is, however, essential that the magnetic field be uniform at the position of the mirror electrode, and to this end a permanent magnet in the form of an annulus has been built into the mirror electrode. Rather than a conventional epicyclic gear with meshing teeth, a Rotrex traction-drive system that uses oil viscosity to transfer motion between the sun, planets and annulus, has been adopted. |
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