oriel

[awr-ee-uh l, ohr‐] /ˈɔr i əl, ˈoʊr‐/
noun
1.
a bay window, especially one cantilevered or corbeled out from a wall.
2.
(in medieval architecture) a large bay window of a hall or chamber.
Origin
1350-1400; Middle English < Anglo-French oriol porch, passage, gallery, perhaps ≪ Latin aureolus “gilded”
Word Origin and History for oriel
n.

"large recessed window," mid-14c., from Old French oriol "hall, vestibule; oriel," of uncertain origin, perhaps from Medieval Latin oriolum "porch, gallery" (mid-13c.), perhaps from Vulgar Latin *auraeolum, dissimilated from aulaeolum, a diminutive of Latin aulaeum "curtain." Despite much research, the sense evolution remains obscure.