spandrel

IPA: spˈændrʌɫ

(architecture) The space (often more or less triangular) between the outer curve of an arch (the extrados) and a straight-sided figure that bounds it; the space between two contiguous arches and a straight feature above them.
(architecture) Horizontal member between the windows of successive storeys of a tall building.
(architecture) The triangular space under a stair; the material that fills the space.
An oriental rug having a pattern of arches; the design in the corners of such a rug, especially in a prayer rug.
(evolutionary theory) A phenotypic characteristic that evolved as a side effect of an adaptation in response to evolutionary pressure.

Examples of "spandrel" in Sentences

Community is important but is, in many cases, a 'spandrel' of sorts.
43 A spandrel is an architectural term that designates the “tapering triangular spaces formed by the intersection of two rounded arches at right angles.”
Well, a spandrel is the small brass ornament at the corner that fills in the triangular gap left between the circular face and the square outline of the case.
Years ago, Stephen Jay Gould and Richard Lewontin borrowed the term spandrel from architecture to illustrate an important consequence of the way evolution works.
The fact that we know those stories are fictional may indeed make such exercise a "spandrel," an unnecessary side effect of our brains 'power to find order in facts.
The horizontal beam, known as a spandrel, was designed to hold up floor sections of the deck, according to David Tyndall, of Gateway Development, the owners of the Centergy Building and parking deck.
This is an example of a byproduct or what Stephen Jay Gould famously called a spandrel -- a trait that has no benefit and can be very costly, but remains in the population by being connected to other traits that do have a benefit.