(n): a vertical structure that divides or separates (as a wall divides one room from another)
(n): anything that suggests a wall in structure or function or effect
(n): a tangible and visible entity; an entity that can cast a shadow
(n): (anatomy) a layer (a lining or membrane) that encloses a structure
(n): one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
(n): a difficult or awkward situation
(n): a condition or state of affairs almost beyond one's ability to deal with and requiring great effort to bear or overcome
(n): a vertical (or almost vertical) smooth rock face (as of a cave or mountain)
(n): (geology) the geological features of the earth
(n): a layer of material that encloses space
(n): single thickness of usually some homogeneous substance
(n): a masonry fence (as around an estate or garden)
(n): a barrier that serves to enclose an area
(n): an embankment built around a space for defensive purposes
(n): a long artificial mound of stone or earth; built to hold back water or to support a road or as protection
(v): surround with a wall in order to fortify
(v): shield from danger, injury, destruction, or damage
