What architectural term refers to the area between arches or windows?

The term that refers to the area between arches or windows is "spandrel." In architectural design, spandrels are the triangular or curvilinear spaces that are formed when arches or vaults intersect with horizontal features, such as a beam or a cornice above. These spaces can often be decorative and might be filled with stone, plaster, or other materials, serving both structural and aesthetic purposes. Spandrels are significant in the study of arch construction and can influence how spaces are visually perceived in a building.

The other terms listed describe different architectural concepts. "Pseudoperipteral" refers to a style of temple that incorporates engaged columns along the sides, giving the illusion of being fully surrounded by columns without actually being a true peripteral temple. "Radial vault" refers to a specific vaulting technique where a series of arches radiate from a central point, typically found in dome structures. "Taberna" is a term used in Roman architecture to describe a shop or a space that opens directly to the street, commonly seen in ancient city planning. Understanding these distinctions enhances one's appreciation of architectural vocabulary and history.