Definition of clerestory noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈklɪəstɔːri//
; NAmE NAmE//ˈklɪrstɔːri//
(pl. clerestories) (architecture)
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the upper part of a wall in a large church, with a row of windows in it, above the level of the lower roofs Word Originlate Middle English: from clear + storey.
See the Oxford Advanced American Dictionary entry: clerestory