A ________ is a built-out portion of a wall that forms a bulge.

A pilaster is a structural element that looks like a column but is partially embedded in a wall. It serves as a decorative feature while also providing support to the wall. The bulging effect of a pilaster is a visual and functional characteristic, allowing it to provide additional strength to the wall it is part of, often highlighting architectural style.

In contrast, a column is a vertical structural element that supports loads, while a brace is a structural device used to provide support and stability, often used in frameworks. A footing, on the other hand, is a structural element that distributes the load of a building onto the ground. The distinguishing feature of a pilaster is its integration into the wall and its bulging appearance, setting it apart from these other construction elements.