[me.nis.cus] n, pl me.nis.ci also me.nis.cus.es [NL, fr. Gk meniskos, fr. dim. of mene moon, crescent--more at moon] (1693) 1: a concavo-convex lens
2: a crescent or crescent-shaped body
3: the curved upper surface of a column of liquid
4: a fibrous cartilage within a joint esp. of the knee