meniscus

definition: (physics) the curved upper surface of a nonturbulent liquid in a vertical tube
example:
speech part: noun
synonyms:
definition: (optics) a lens that is concave on one side and convex on the other
example:
speech part: noun
synonyms:
definition: (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint
example:
speech part: noun
synonyms: semilunar cartilage

How meniscus is being used?