English

A: The bottom of a concave meniscus.
B: The top of a convex meniscus.

Noun

meniscus ‎(plural meniscuses or menisci)

1. A crescent moon, or an object shaped like it. [from 17th c.]
   • 1972, Vladimir Nabokov, Transparent Things, McGraw-Hill 1972, p. 19:

     He opened wide both casements; they gave on a parking place four floors below; the thin meniscus overhead was too wan to illumine the roofs of the houses descending toward the invisible lake [...].

2. (optics) A lens which is convex on one side and concave on the other, being crescent-shaped in cross-section. [from 17th c.]
3. The curved surface of liquids in tubes, whether concave or convex, caused by the surface tension of the liquid. [from 19th c.]
4. (anatomy) Either of two parts of the human knee that provide structural integrity to the knee when it undergoes tension and torsion. [from 19th c.]

Translations

See also

• lunette