The upper part of the nave, choir, and transepts of a cathedral or other large church, lying above the triforium (or, if there is no triforium…
An upper storey (in quot. 1478 spec. a clerestory). Obsolete. rare.
Esp. in Ireland: a room or series of rooms between the vaulting and the roof of a church. Contrasted with undercroft, n.
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