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

 

oriel

 noun
noun
BrE BrE//ˈɔːriəl//
 
; NAmE NAmE//ˈɔːriəl//
 
(architecture)
 
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a part of a building, like a small room with windows, that sticks out from a wall above the ground an oriel window Word Origin late Middle English: from Old French oriol ‘gallery’, of unknown origin; compare with medieval Latin oriolum ‘upper chamber’.
See the Oxford Advanced American Dictionary entry: oriel