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S vs Annulus - What's the difference?

s | annulus |

As a letter s

is the letter s with a.

As a noun annulus is

a ring- or donut-shaped area or structure.

s

Translingual

{{Basic Latin character info, previous=r, next=t, image= (wikipedia s)

Letter

  • The nineteenth letter of the .

    • Symbol

    (wikipedia) (mul-symbol)
  • voiceless alveolar fricative
  • Symbol for second , an SI unit of measurement of time.

    • See also

    (Latn-script) * * (esh) * (dze) * {{Letter , page=S , NATO=Sierra , Morse=ยทยทยท , Character=S , Braille=? }} Image:Latin S.png, Capital and lowercase versions of S , in normal and italic type Image:Fraktur letter S.png, Uppercase and lowercase S in Fraktur Symbols for SI units ----

    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