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Lemniscate vs Annulus - What's the difference?

lemniscate | annulus |

As nouns the difference between lemniscate and annulus

is that lemniscate is the infinity symbol () while annulus is a ring- or donut-shaped area or structure.

lemniscate

English

(wikipedia lemniscate)

Noun

(en noun)
  • The infinity symbol ().
  • (mathematics) The lemniscate of Bernoulli
  • (mathematics) Any of a variety of quartic functions producing similar figure-of-eight closed curves.

    • Synonyms

    * (symbol) infinity, infinity symbol

    Hyponyms

    * hippopede * lemniscate of Bernoulli * lemniscate of Booth * lemniscate of Gerono * lemniscate of Huygens

    Derived terms

    * lemniscate case * lemniscate constant * lemniscate function * lemniscate inverse curve * lemniscate of Bernoulli * lemniscate of Booth * lemniscate of Gerono * lemniscate of Huygens * lemniscatic

    Anagrams

    * * ----

    annulus

    English

    Noun

    (en-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.

    • Synonyms

    * (topological space) cylinder

    Hyponyms

    * (ring-shaped structure) torus

    Derived terms

    * annulate * annulation