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A window sill (also written as windowsill or window-sill) is the surface at the bottom of a window.
A dictionary of architecture categorically defined the characteristics of a windowsill as:
- The lowest form of window casement. Windowsills hold pieces in place and slope downward to drain water. In a well hung window, the lower sash rests on the chin;
- The horizontal piece below a window unit in masonry construction or in wood framing. The window sill of the window frame sits on the window sill of the wall opening;
- The lowermost, interior trim work on a window;
- Meets the dictionary definition of a shelf "A flat, usually rectangular structure composed of a rigid material, such as wood, glass, or metal, fixed at right angles to a wall or other vertical surface and used to hold or store objects." 
- Sturgis, Russell. A dictionary of architecture and building: biographical, historical, and descriptive , vol.3. New York: The Macmillan Co. ;, 1901. 1,100. Print.