me·nis·cus /məˈnɪskəs/
  新月,半月板
  me·nis·cus /məˈnɪskəs/ 名詞
  彎月面,新月面
  Me·nis·cus n.; pl. L. Menisci E. Meniscuses
  1. A crescent.
  2. Opt. A lens convex on one side and concave on the other.
  3. 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.
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  meniscus
       n : a disk of cartilage that serves as a cushion between the
           ends of bones that meet at a point
       [also: menisci (pl)]