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"
Antonine Wall - a fortification 37 miles long across the narrowest part of southern Scotland (between the Firth of Forth and the Firth of Clyde)
bailey - the outer defensive wall that surrounds the outer courtyard of a castle
battlement / crenelation / crenellation - a rampart built around the top of a castle with regular gaps for firing arrows or guns
Chinese Wall / Great Wall / Great Wall of China - a fortification 1,500 miles long built across northern China in the 3rd century BC
earthwork - an earthen rampart
fraise - sloping or horizontal rampart of pointed stakes
merlon - a solid section between two crenels in a crenelated battlement
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"
attic - (architecture) a low wall at the top of the entablature
bearing wall - any wall supporting a floor or the roof of a building
cavity wall - a wall formed of two thicknesses of masonry with a space between them
chimney breast - walls that project out from the wall of a room and surround the chimney base
firewall - fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle
gable / gable end / gable wall - the vertical triangular wall between the sloping ends of gable roof
parapet - a low wall along the edge of a roof or balcony
proscenium / proscenium wall - the wall that separates the stage from the auditorium in a modern theater
sidewall - a wall that forms the side of a structure
wainscoting / wainscotting - a wainscoted wall (or wainscoted walls collectively)
Wailing Wall - a wall in Jerusalem
Hadrian's Wall - an ancient Roman wall built by Hadrian in the 2nd century
a masonry fence (as around an estate or garden); "the wall followed the road"; "he ducked behind the garden wall and waited"
party wall - a wall erected on the line between two properties and shared by both owners
retaining wall - a wall that is built to resist lateral pressure (especially a wall built to prevent the advance of a mass of earth)
a layer of material that encloses space; "the walls of the cylinder were perforated"; "the container''s walls were blue"
(anatomy) a layer (a lining or membrane) that encloses a structure; "stomach walls"
anatomy / general anatomy
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"
footwall - the lower wall of an inclined fault
hanging wall - the upper wall of an inclined fault
a vertical (or almost vertical) smooth rock face (as of a cave or mountain)
a difficult or awkward situation; "his back was to the wall"; "competition was pushing them to the wall"
surround with a wall in order to fortify
stockade - surround with a stockade in order to fortify
circumvallate - surround with or as if with a rampart or other fortification