The Collaborative International Dictionary of English v.0.48:

Kneed \Kneed\, a.
   1. Having knees;- used chiefly in composition; as, in-kneed;
      out-kneed; weak-kneed.
      [1913 Webster]

   2. (Bot.) Geniculated; forming an obtuse angle at the joints,
      like the knee when a little bent; as, kneed grass.
      [1913 Webster]