AskDefine | Define annulus

Dictionary Definition

annulus

Noun

1 a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke" [syn: ring, halo, anulus, doughnut, anchor ring]
2 (Fungi) remnant of the partial veil that in mature mushrooms surrounds the lower part of the stem [also: annuli (pl)]

User Contributed Dictionary

English

Noun

  1. A ring- or donut-shaped area or structure.
  2. In mathematics, the region between two concentric circles of different radius.
  3. In astronomy, the ring of the sun not covered by the moon in an annular solar eclipse.
  4. The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.

Extensive Definition

Annulus (or anulus), being the Latin and French for "ring", is a term used to describe various ring or circle shaped objects (or openings):
  • Annular hurricane, a hurricane that is nearly symmetrical and takes longer to weaken than normal hurricanes.

References

annulus in German: Annulus
Sharp, J. M., Jr., 1999, A Glossary of Hydrogeological Terms: The University of Texas, Austin, Texas
Principles of Contaminant Hydrogeology - Google Books Resultby Christopher M. Palmer - 1996 - Science - 256 pages
Schnirel, Brian - Leeway Corucia Research Center (LCRC), 2008 Watching for potential death traps The Official Discussion Board of the American Association of Zoo Keepers ... General discussion forum.
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