clerestory

[clerestory] Part of a building rising above the roofs of other parts and pierced by windows, applied especially to churches whose division into central nave and side aisles of less height and width permits lighting from windows above the aisle roofs; found in the earliest Christian basilicas as well as Byzantine and Romanesque churches, and most beautifully developed in Gothic in relation to ribbed vaulting and flying buttresses.

New Catholic Dictionary

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