ANNULUS
Annulus
In mathematics, an annulus is a ring-shaped object, especially a region bounded by two concentric circles. The adjectival form is annular .The above text is a snippet from Wikipedia: Annulus (mathematics)
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annulus
Noun
- A ring- or donut-shaped area or structure.
- The region in a plane between two concentric circles of different radius.
- Any topological space homeomorphic to the region in a plane 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 result of drying.
- The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
- The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
The above text is a snippet from Wiktionary: annulus
and as such is available under the Creative Commons Attribution/Share-Alike License.