annulus vs skirt

annulus

noun
  • A ring- or donut-shaped area or structure. 

  • The ring of the sun not covered by the moon in an annular solar eclipse. 

  • Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying. 

  • The region in a plane between two concentric circles of different radii. 

  • The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom. 

  • The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow. 

  • Any topological space homeomorphic to the region in a plane between two concentric circles of different radius. 

skirt

noun
  • The part of a dress or robe, etc., that hangs below the waist. 

  • An article of clothing, usually worn by women and girls, that hangs from the waist and covers the lower part of the body. 

  • Border; edge; margin; extreme part of anything. 

  • The diaphragm, or midriff, in animals 

  • A petticoat. 

  • Women collectively, in a sexual context. 

  • A woman. 

  • Sexual intercourse with a woman. 

  • A loose edging to any part of a dress. 

verb
  • To avoid or ignore (something); to manage to avoid (something or a problem); to skate by (something). 

  • To be on or form the border of. 

  • To move around or along the border of; to avoid the center of. 

  • To cover with a skirt; to surround. 

How often have the words annulus and skirt occurred in a corpus of books? (source: Google Ngram Viewer )