cavity wall(n = noun.artifact) - a wall formed of two thicknesses of masonry with a space between them;
is a kind of wall

abdominal cavity, abdominal wall, american wall fern, amniotic cavity, antonine wall, axillary cavity, bearing wall, blank wall, blue wall, blue wall of silence, bodily cavity, buccal cavity, cavity, cavity resonator, cell wall, chest cavity, chinese wall, cleavage cavity, cotyloid cavity, cranial cavity, drive up the wall, dry wall, dry-stone wall, gable wall, glenoid cavity, great wall, great wall of china, hadrian's wall, handwriting on the wall, hanging wall, hole in the wall, intracranial cavity, lesser peritoneal cavity, nasal cavity, off the wall, oral cavity, orbital cavity, party wall, pelvic cavity, pericardial cavity, peritoneal cavity, pleural cavity, proscenium wall, pulp cavity, retaining wall, sea wall, segmentation cavity, siberian wall flower, stone wall, thoracic cavity, tubular cavity, tympanic cavity, uterine cavity, wailing wall, wall, wall barley, wall clock, wall creeper, wall fern, wall germander, wall hanging, wall in, wall of silence, wall painting, wall panel, wall pellitory, wall pepper, wall plate, wall plug, wall rock, wall rocket, wall rue, wall rue spleenwort, wall socket, wall st., wall street, wall tent, wall unit, wall up, western wall flower