spandrel

English Thesaurus

1. an approximately triangular surface area between two adjacent arches and the horizontal plane above them (noun.artifact)

hypernym	:	surface,
definition	:	the outer boundary of an artifact or a material layer constituting or resembling such a boundary (noun.artifact)

domain category	:	architecture,
definition	:	the discipline dealing with the principles of design and construction and ornamentation of fine buildings (noun.cognition)