Cities were surrounded by walls, as distinguished from "unwalled villages" (Ezek. 38:11; Leviticus 25:29-34). They were made thick and strong (Numbers 13:28; Deuteronomy 3:5). Among the Jews walls were built of stone, some of those in the temple being of great size (1 Kings 6:7; 7:9-12; 20:30; Mark 13:1, 2). The term is used metaphorically of security and safety (Isaiah 26:1; 60:18; Revelation 21:12-20). (see FENCE.)

Noah Webster's New International Dictionary of the English Language

1. (n.) A kind of knot often used at the end of a rope; a wall knot; a wale.

2. (n.) A work or structure of stone, brick, or other materials, raised to some height, and intended for defense or security, solid and permanent inclosing fence, as around a field, a park, a town, etc., also, one of the upright inclosing parts of a building or a room.

3. (n.) A defense; a rampart; a means of protection; in the plural, fortifications, in general; works for defense.

4. (n.) An inclosing part of a receptacle or vessel; as, the walls of a steam-engine cylinder.

5. (n.) The side of a level or drift.

6. (n.) The country rock bounding a vein laterally.

7. (v. t.) To enclose with a wall, or as with a wall.

8. (v. t.) To defend by walls, or as if by walls; to fortify.

9. (v. t.) To close or fill with a wall, as a doorway.