wall

wall (http://definr.com/wall)

     n 1: an architectural partition with a height and length greater
          than its thickness; used to divide or enclose an area or
          to support another structure; "the south wall had a
          small window"; "the walls were covered with pictures"
     2: an embankment built around a space for defensive purposes;
        "they stormed the ramparts of the city"; "they blew the
        trumpet and the walls came tumbling down" [syn: rampart,
         bulwark]
     3: anything that suggests a wall in structure or effect; "a
        wall of water"; "a wall of smoke"; "a wall of prejudice"
     4: a masonry fence (as around an estate or garden); "the wall
        followed the road"; "he ducked behind the garden wall and
        waited"
     5: (anatomy) a layer (a lining or membrane) that encloses a
        structure; "stomach walls" [syn: paries]
     6: a vertical (or almost vertical) smooth rock face (as of a
        cave or mountain)
     7: a layer of material that encloses space; "the walls of the
        cylinder were perforated"; "the container's walls were
        blue"
     8: a difficult or awkward situation; "his back was to the
        wall"; "competition was pushing them to the wall"
     v : surround with a wall in order to fortify [syn: palisade, fence,
          fence in, surround]