What does "meniscus" mean?

Meniscus: (Opt.) A lens convex on one side and concave on the other.

Additional senses

  1. 2.(Anat.) An interarticular synovial cartilage or membrane; esp., one of the intervertebral synovial disks in some parts of the vertebral column of birds. Converging meniscus, Diverging meniscus. See Lens.

Sources