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Learned borrowing from Medieval Latin ānnulus, a misspelling of Latin ānulus (“ring, especially one worn on a finger”), from ānus (“ring”) (from Proto-Indo-European *h₁eh₂no- (“ring”)) + -ulus (diminutive suffix).
- Plural (annuli):
- A ring- or donut-shaped area or structure.
- Hyponym: torus
- (geometry) The region in a plane between two concentric circles of different radii.
- (topology) Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
- Synonym: cylinder
- (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.
geometry: the region in a plane between two concentric circles of different radius
astronomy: the ring of the sun not covered by the moon
botany: structure in a fern
- annulus (botany) on Wikipedia.Wikipedia
- annulus (mathematics) on Wikipedia.Wikipedia
- annulus (mycology) on Wikipedia.Wikipedia
- annulus (disambiguation) on Wikipedia.Wikipedia
- (Classical) IPA(key): /ˈaːn.nu.lus/, [ˈäːnːʊɫ̪ʊs̠]
- (modern Italianate Ecclesiastical) IPA(key): /ˈan.nu.lus/, [ˈänːulus]
- Alternative form of
- annulus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
- “annulus”, in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
- “annulus”, in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin