Solarium may refer to: Sunroom, a room built largely of glass to afford exposure to the sun. A Terrace (building) or flat housetop. The Solarium Augusti, a monumental meridian line (or perhaps a sundial) erected in Rome by Emperor Augustus.
Noun. 1. cavity wall-a wall formed of two thicknesses of masonry with a space between them. wall-an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure; the south wall had a small window; the walls were covered with pictures.
The coelom is a space between the gut wall and the body wall that acts as a cavity for other organs. It begins to form during the stage of embryonic development where the body cavities develop, and it allows the body's organs to move around while offering some support to the skeletal system. Continue Reading.