Illustrated Dictionary of British Churches - Triforium Definition
History and Architecture
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Triforium
A galleried arcade at second floor level, above the nave arcade and below the clerestory level, extending around the interior of a church. Sometimes called blind-storey, triforium used blind-arcading, without windows, which were impossible as the triforium was level with the aisle roof.
Related: Arcade Clerestory Aisle Nave
