a continuous vertical brick or stone structure that encloses or divides an area of land

a garden wall

a thing regarded as a protective or restrictive barrier

police investigating the murders met a wall of silence from witnesses

the membranous outer layer or lining of an organ or cavity

the wall of the stomach

the rock enclosing a lode or seam

enclose (an area) within walls, especially for protection or privacy

parts of the city's East End had been walled off with concrete barricades