Definition of "wall" []

• An upright structure of masonry, wood, plaster, or other building material serving to enclose, divide, or protect an area, especially a vertical construction forming an inner partition or exterior siding of a building. (noun)
• A continuous structure of masonry or other material forming a rampart and built for defensive purposes. Often used in the plural. (noun)
• A structure of stonework, cement, or other material built to retain a flow of water. (noun)
• Something resembling a wall in appearance, function, or construction, as the exterior surface of a body organ or part: the abdominal wall. (noun)
• Something resembling a wall in impenetrability or strength: a wall of silence; a wall of fog. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "We may refer to all sets adapted to be mounted on a wall or partition as _wall telephones_, and to all in which the receiver, transmitter, and hook are provided with a standard of their own to enable them to rest on any flat surface, such as a desk or table, as _desk telephones_."
• "The letter articulated both the principle and the phrase 'wall of separation between church and state' at the core of the then-new republic."
• "The 21st-century equivalent of the Berlin wall is a cyberbarrier, and we can help puncture it."