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Related to spandril: spandrel, spandrel glass
1. An area, roughly triangular in shape, included between the extradoses of two adjoining arches and a line approximately connecting their crowns (or a space approximately equal to half this in the case of a single arch); in medieval architecture, often ornamented with tracery, etc.
2. In a multistory building, a wall panel filling the space between the top of the window in one story and the sill of the window in the story above.
3. A surface, roughly triangular in shape, as below a stair string.