n. 1 continuous vertical narrow structure of usu. brick or stone, esp. enclosing or dividing a space or supporting a roof. 2 thing like a wall, esp.: a a steep side of a mountain. b Anat. the outermost layer or enclosing membrane etc. of an organ etc. v. 1 (esp. as walled adj.) surround with a wall. 2 a (usu. foil. by up, qff) block (a space etc.) with a wall. b (foil. by up) enclose within a sealed space. o go to the wall be defeated or pushed aside. up the wall colloq. crazy or furious. walls have ears beware of eavesdroppers. o wallless adj. [Latin vallum rampart]
