n :  any of several more or less cross-shaped ligaments: as  a  :  either of two ligaments in the knee joint which cross each other from femur to tibia (1) :  an anterior one that limits extension and rotation - called also anterior cruciate ligament  (2) :  a posterior one that prevents dislocation of the femur in a forward direction - called also posterior cruciate ligament   b  :  a complex ligament made up of the transverse ligament of the atlas and vertical fibrocartilage extending from the dens to the border of the foramen magnum .
 
 
 
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