half-moon vs meniscus

half-moon

noun
  • The moon in its first or last quarter when only half the visible face is illuminated; a quarter moon. 

  • A semicircular or crescent-shaped Filipino butter cookie. 

  • Anything shaped like a crescent, especially the base of a fingernail. 

  • Synonym of black and white (“type of cookie”) 

meniscus

noun
  • A crescent moon, or an object shaped like it. 

  • A lens which is convex on one side and concave on the other, being crescent-shaped in cross-section. 

  • The curved surface of liquids in tubes, whether concave or convex, caused by the surface tension of the liquid. 

  • Either of two parts of the human knee that provide structural integrity to the knee when it undergoes tension and torsion. 

How often have the words half-moon and meniscus occurred in a corpus of books? (source: Google Ngram Viewer )