Noun
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"3. anything that suggests a wall in structure or function or effect;
"a wall of water""a wall of smoke""a wall of prejudice""negotiations ran into a brick wall"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"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"