annuli

/AE1 N Y AH0 L AY0/

noun

1
A ring- or donut-shaped area or structure.
2
The region in a plane between two concentric circles of different radii.
3
Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
4
The ring of the sun not covered by the moon in an annular solar eclipse.
5
Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
6
The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
7
(oil and gas production) The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.

Synonyms

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