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مهندسی عمران و معماری:
spandrel beam
تیر محیطی
an approximately triangular surface area between two adjacent arches and the horizontal plane above them(n)
Synonyms: spandrel
spandril
Hypernyms: surface
A spandrel is a roughly triangular space, usually found in pairs, between the top of an arch and a rectangular frame, between the tops of two adjacent arches, or one of the four spaces between a circle within a square. They are frequently filled with decorative elements.