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Word: annulus
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Meaning:
Noun:
- A ring- or donut-shaped area or structure.
- astronomy The ring of the 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.
- oil and gas production The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
- mathematics The region between two concentric circles of different radius.
- mycology The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
Source: Wiktionary
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