'Spandrel' definitions:

Definition of 'spandrel'

(from WordNet)
noun
An approximately triangular surface area between two adjacent arches and the horizontal plane above them [syn: spandrel, spandril]

Definition of 'Spandrel'

From: GCIDE
  • Spandrel \Span"drel\, n. [From Span.]
  • 1. (Arch.) The irregular triangular space between the curve of an arch and the inclosing right angle; or the space between the outer moldings of two contiguous arches and a horizontal line above them, or another arch above and inclosing them. [1913 Webster]
  • 2. A narrow mat or passe partout for a picture. [Cant] [1913 Webster]