different between annuls vs annulus

English

Pronunciation

• IPA^(key): /??n?lz/

Verb

annuls

1. Third-person singular simple present indicative form of annul

English

Etymology

Borrowed from Latin annulus.

Noun

annulus (plural annuluses or annuli)

1. A ring- or donut-shaped area or structure.
2. (geometry) The region in a plane between two concentric circles of different radii.
3. (topology) Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
4. (astronomy) The ring of the sun not covered by the moon in an annular solar eclipse.
5. (botany) Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
6. (mycology) 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

• (topological space): cylinder

Hyponyms

• (ring-shaped structure): torus

Related terms

• annular

Derived terms

• annulate
• annulation

Translations

Latin

Pronunciation

• (Classical) IPA^(key): /?a?n.nu.lus/, [?ä?n?????s?]
• (Ecclesiastical) IPA^(key): /?an.nu.lus/, [??n?ulus]

Noun

?nnulus m (genitive ?nnul?); second declension

1. Alternative form of ?nulus

Declension

Second-declension noun.

Descendants

• English: annulus, annulet

References

• annulus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 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