A window or series of windows in a wall above the primary roofline; designed to provide additional lighting and ventilation for the central part of a building. (A series or band of vertical windows set above the primary roof line.)
Window situated on top of a vertical structure to furnish air and light for the inside. Raised section of roof with windows. Wall of a church or any similar windowed wall, which rises above the roofs of the flanking aisles and contains windows for lighting the central part of the structure.