What is an annulus?

What is an annulus? Here are some definitions.

Noun 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. Find more words! 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What is the opposite of annulus? Sentences with the word annulus Words that rhyme with annulus What is the plural of annulus? What is the adverb for annulus? What is the adjective for annulus? What is the noun for annulus? Nearby Definitions annuls annulotomy annulotomies annulose annulosans annulosan annuluses annulus fibrosus annulus of Zinn annumerate annumerated annumerates 7-letter Words Starting With a an ann annu annul annulu