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Definition of clerestory noun from the Oxford Advanced American Dictionary

 

clerestory

 noun
noun
NAmE//ˈklɪrˌstɔri//
 
(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
See the Oxford Advanced Learner's Dictionary entry: clerestory