n.; pl. L. Menisci E. Meniscuses [ NL., from Gr. mhni`skos, dim. of mh`nh the moon. ] 1. A crescent. [ 1913 Webster ]
2. (Opt.) A lens convex on one side and concave on the other. [ 1913 Webster ]
3. (Anat.) An interarticular synovial cartilage or membrane; esp., one of the intervertebral synovial disks in some parts of the vertebral column of birds. [ 1913 Webster ]
Converging meniscus, Diverging meniscus. See Lens. [ 1913 Webster ]