annulus
Noun
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Noun
annulus (plural annuluses or annuli)
- A ring- or donut-shaped area or structure.
- (geometry) The region in a plane between two concentric circles of different radius.
- (topology) Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
- (astronomy) The ring of the sun not covered by the moon in an annular solar eclipse.
- (botany) Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
- (mycology) The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
- (oil and gas production) The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
- (topological space) cylinder
- Russian: кольцо́
- Spanish: corona circular
- Spanish: corona solar
- Spanish: anillo
This text is extracted from the Wiktionary and it is available under the CC BY-SA 3.0 license | Terms and conditions | Privacy policy 0.003