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clearstory(both: klĭr`stōr'ē, –stôr'ē), a part of a building whose walls rise higher than the roofs of adjoining parts of the structure. Pierced by windows, it is chiefly a device for obtaining extra light. It had an early use in certain Egyptian temples, as at Karnak, and was used later in the great halls of Roman basilicas. It became a characteristic element of medieval churches, receiving its fullest development in churches of the Gothic period.
The upward extension of enclosed space achieved by bringing a windowed wall up to interrupt the slope of the roof.
clerestory, clerestory window
1.An upper zone of wall pierced with windows that admit light to the center of a lofty room.
2. A window so placed. (See illustration p. 218.)
1. a row of windows in the upper part of the wall of a church that divides the nave from the aisle, set above the aisle roof
2. the part of the wall in which these windows are set