in open string stairs, a rectangular or shaped block covering the ends of the steps between treads and risers.
Clerestorey
an upper row of windows in a cathedral.
Open string
A sloping member of a staircase covering the ends of the treads and risers and cut into their shape; hence an open-string staircase. Compare closed string.Opus sectileDecorative mosaic-like facing.
STRING
Sloping member holding the ends of the treads and risers of a staircase. Close string: a broad string covering the ends of the treads and risers. Open string: cut into the shape of the treads and risers.
 See also: Staircase, Riser, Timber, Tread, Member
  
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