DICT.TW Dictionary Taiwan

 span·drel /ˈspændrəl/
 拱肩

 Span·drel n.
 1. Arch. The 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.
 2. A narrow mat or passe partout for a picture. [Cant]
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 spandrel
      n : an approximately triangular surface area between two
          adjacent arches and the horizontal plane above them [syn:
           spandril]