Architecture. an area between the extradoses of two adjoining arches, or between the extrados of an arch and a perpendicular through the extrados at the springing line.
(in a steel-framed building) a panellike area between the head of a window on one level and the sill of a window immediately above.
Philately. the decoration occupying the space at the corner of a stamp between the border and an oval or circular central design.
Also, spandril.

1470–80; earlier spaundrell, probably < Anglo-French spaundre, itself perhaps cognate with Old French espandre to expand Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spandrel or spandril (ˈspændrəl)
1.  an approximately triangular surface bounded by the outer curve of an arch and the adjacent wall
2.  the surface area between two adjacent arches and the horizontal cornice above them
[C15 spaundrell, from Anglo-French spaundre spandrel, from Old French spandre to spread, expand]
spandril or spandril
[C15 spaundrell, from Anglo-French spaundre spandrel, from Old French spandre to spread, expand]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1477, "triangular space between the outer curves of an arch," apparently a diminutive of Anglo-Fr. spaundre (1395), perhaps aphetic of espandre "to expand, extend," from L. expandre (see expand).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It features a tapered arch ring, which is cast integrally with the plain-faced
  concrete spandrel walls.
Poured concrete, open spandrel arch bridge, one of two in the state.
The bridge is a ten-span poured concrete, open spandrel structure.
Although it is in fact a closed spandrel arch, it has a graceful blind arcade
  to imitate an open spandrel arch.
Related Words
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