Crosspiece

from WordNet (r) 3.0 (2006)

crosspiece
    n 1: a horizontal beam that extends across something [syn:
         {trave}, {traverse}, {crossbeam}, {crosspiece}]
    2: a transverse brace

from The Collaborative International Dictionary of English v.0.48

Crosspiece \Cross"piece`\ (kr?s"p?s`; 115), n.
   1. A piece of any structure which is fitted or framed
      crosswise.
      [1913 Webster]

   2. (Naut.) A bar or timber connecting two knightheads or two
      bitts.
      [1913 Webster]