ulna

from WordNet (r) 3.0 (2006)

ulna
    n 1: the inner and longer of the two bones of the human forearm
         [syn: {ulna}, {elbow bone}]

from The Collaborative International Dictionary of English v.0.48

Ulna \Ul"na\ ([u^]l"n[.a]), n. [L., the elbow. See {Ell}.]
   1. (Anat.) The postaxial bone of the forearm, or brachium,
      corresponding to the fibula of the hind limb. See
      {Radius}.
      [1913 Webster]

   2. (O. Eng. Law) An ell; also, a yard. --Burrill.
      [1913 Webster]