meniscus

noun

1. (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint

Definition categories: body, cartilage, gristle

2. (optics) a lens that is concave on one side and convex on the other

Definition categories: man–made, lens, lense

3. (physics) the curved upper surface of a nonturbulent liquid in a vertical tube

Definition categories: man–made, surface