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spandrel
In architecture, this term refers to a specific geometric void. It is most frequently associated with decorative arts, as these spaces are often filled with mosaics or sculptures to mask the structural transition from a curve to a straight edge.
In the context of evolutionary biology, the term is used as a metaphor to describe traits that lack their own adaptive purpose. These biological spandrels are incidental consequences of other evolutionary changes, meaning they exist not because they provide a survival advantage, but because they are structural byproducts of a different, beneficial adaptation.
Meanings
The triangular space between the outer curve of an arch and the rectangular frame or enclosing wall that surrounds it.
The architect decided to fill each spandrel with a carved floral motif.