meniscus
noun /məˈnɪskəs/
  /məˈnɪskəs/
(plural menisci 
 /məˈnɪsaɪ/
  /məˈnɪsaɪ/
)- (physics) the curved surface of a liquid in a tube
- (anatomy) a thin layer of cartilage between the surfaces of some joints, for example the knee
Word Originlate 17th cent.: modern Latin, from Greek mēniskos ‘crescent’, diminutive of mēnē ‘moon’.