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annulus 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/ˈanyələs/,
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annuli, plural;
  1. A ring-shaped object, structure, or region

  1. ring: a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
  2. (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar
  3. The Annulus, or annular space, is the space between a penetrant and whatever surrounds it, such as the sides of an opening or a sleeve, as the case may be.
  4. In mathematics, an annulus (the Latin word for "little ring", with plural annuli) is a ring-shaped geometric figure, or more generally, a term used to name a ring-shaped object. Or, it is the area between two concentric circles. The adjectival form is annular (for example, an annular eclipse).
  5. An annulus is the ring like structure sometimes found on the stipe of a mushroom. The annulus represents the remaining part of the partial veil, after it has ruptured to expose the gills or other spore-producing surface. An annulus may be thick and membranous, or it may be cobweb-like. ...
  6. The annulus (yellow area in diagram) of an oil well refers to any void between any piping, tubing or casing and the piping, tubing or casing immediately surrounding it. ...
  7. In zoology, an annulus is an indication of growth in certain species, similar to dendrochronology. For example, in fish, it is a series of of concentric rings (or) formed in the scales of bony fish., whereas in bivalves, they are the concentric rings found on their shells.
  8. The Annulus (sometimes rendered ANNULUS) is a fictional criminal organization featured in the Azteca Productions' Universe created by Richard Dominguez. The Annulus is a South American-based secret cabal of businessmen. ...
  9. A ring- or donut-shaped area or structure; The region between two concentric circles of different radius; The ring of the sun not covered by the moon in an annular solar eclipse; Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a ...
  10. (Annuli) Pattern of growth rings on the scutes of tortoises
  11. A mark or ring that forms annually on the otoliths, scales, and other bones of fish, that correspond to the annual period of slow growth that fish go through. Annuli are used by fish managers to determine age and growth of fish.
  12. The tough outer ring of a spinal disc.
  13. the space between two concentric lengths of pipe or between pipe and the hole in which it is located.
  14. (pl. annuli, adj. annulate)
  15. The space between the drillstring and the well wall, or between casing strings, or between the casing and the production tubing
  16. a node near the apex of the ramicaul and is the origination of the spathe or sheath that gives rise to the inflorescence
  17. Ringlike markings on the scales (or spines and vertebrae) of a fish that are used to determine age.
  18. On the sporangium of most ferns, a row of cells with partly thickened walls that functions in the release of spores.
  19. a ring around the stem of mushrooms, the remains of the partial veil.
  20. a ring of tissue on the stipe of mushroom formed by the rupture of a membrane (the partial veil) connecting the cap and stipe of a developing mushroom. ...
  21. A membraneous skirt surrounding the stipe of a hymenomycete or gasteromycete. (pl. annuli) (15)
  22. A mark or marks formed on a fish scale or bone each year.
  23. In ferns, applied to an elastic ring which partially or wholly surrounds, the sporangium and ruptures it at maturity.
  24. tough fibrous outer wall of an intervertebral disc.
  25. The outer layer of the intervertebral disc, which is located between the vertebral bodies. The annulus is made of collagen fibers.