spandrel

spandrel
[ˈspandrɪl]
noun
  1. (Architecture)the almost triangular space between one side of the outer curve of an arch, a wall, and the ceiling or framework
    (建筑)拱肩
    ■the space between the shoulders of adjoining arches and the ceiling or moulding above
    拱门下的三角形空间
语源
  1. late Middle English: perhaps from Anglo-Norman French spaund(e)re, or from espaundre 'expand'
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