Meaning

noun an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure

noun anything that suggests a wall in structure or function or effect

noun (anatomy) a layer (a lining or membrane) that encloses a structure

originFrom Middle English wal, from Old English weall (“wall, dike, earthwork, rampart, dam, rocky shore, cliff”), from Proto-West Germanic *wall (“wall, rampart, entrenchment”), from Latin vallum (“wall, rampart, entrenchment, palisade”), from Proto-Indo-European *welH- (“to turn, wind, roll”). Perhaps conflated with waw (“a wall within a house or dwelling, a room partition”), from Middle English…

Etymology from Wiktionary, CC BY-SA 3.0