• A structure built for defense surrounding a city, castle etc.

    "The town wall was surrounded by a moat."

  • (chiefly dialectal) A spring of water.
  • A point of defeat or extinction.
  • (often in combination) A barrier.

    "a seawall;  a firewall"

  • (anatomy, zoology, botany) A divisive or containing structure in an organ or cavity.
  • (Internet) A personal notice board listing messages of interest to a particular user.
  • A rampart of earth, stones etc. built up for defensive purposes.
  • A point of desperation.
  • A type of butterfly (Lasiommata megera).
  • Something with the apparent solidity and dimensions of a building wall.

    "a wall of sound;  a wall of water"

  • (soccer) A line of defenders set up between an opposing free-kick taker and the goal.
  • Each of the substantial structures acting either as the exterior of or divisions within a structure.

    "We're adding another wall in this room during the remodeling.  The wind blew against the walls of the tent."

  • (nautical) A kind of knot often used at the end of a rope; a wall knot or wale.
  • An impediment to free movement.

    "A wall of police officers met the protesters before they reached the capitol steps."

  • A barrier to vision.
  • (auction) A fictional bidder used to increase the price at an auction. Also called a chandelier.


  • To enclose with a wall

    "He walled the study with books."

  • (with "up") To seal with a wall

    "They walled up the basement space that had been used as a coal bin."

  • (with "off") To separate with a wall

    "The previous owners had walled off two rooms, making an apartment."

  • To well, as water; spring.
  • (with "in") To enclose by surrounding with walls.

    "They had walled in the garden"

  • To boil.

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