spandrel
nounThe roughly triangular space between the left or right exterior curve of an arch and the rectangular framework surrounding it.
nounThe space between two arches and a horizontal molding or cornice above them.
nounIn architecture, the triangular space comprehended between the outer curve or extrados of an arch, a horizontal line drawn through its apex, and a vertical line through its springing; also, the wall-space between the outer moldings of two arches and a horizontal line or string-course above them, or between these outer moldings and the intrados of another arch rising above and inclosing the two.
nounThe 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.
nounA narrow mat or passe partout for a picture.
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The triangular space under a
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