1. Part of a wall between the head of a window-aperture and the cill of the window above in a building of two or more storeys, especially in a curtain-wall.
2. As spandrel-bracket (1).
3. Any panel filling a spandrel (1, 2, 4, 6).
"spandrel-panel." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (April 9, 2019). https://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/spandrel-panel
"spandrel-panel." A Dictionary of Architecture and Landscape Architecture. . Retrieved April 09, 2019 from Encyclopedia.com: https://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/spandrel-panel