CLEARSTORY, the upper storey of a church; windows near the roof of a building also CLERESTORY [n]
The upper part of the nave, choir, and transepts of a large church, containing a series of windows. It is clear of the roofs of the aisles and admits light to the central parts of the building
Such a series of windows in a church or similar windows in another building
A raised section of roof running down the center of a railroad car, with small windows or ventilators