An oriel window is a form of bay window which protrudes from the main wall of a building but does not reach to the ground. Supported by corbels, brackets, or similar, an oriel window is most commonly found projecting from an upper floor but is also sometimes used on the ground floor.
Oriel windows are seen in Arab architecture in the form of mashrabiya. In Islamic culture, these windows and balconies project from the street-front of a house, providing an area in which women could peer out and see the activities below while remaining invisible.
According to the Oxford English Dictionary, the word "oriel" is derived from Anglo-Norman oriell and post-classical Latin oriolum, both meaning "gallery" or "porch", perhaps from classical Latin aulaeum, "curtain".
Oriel window located in Grande Île, Strasbourg
Massive half timbered oriel window on a pre-1581 house, Bouxwiller, Bas-Rhin, Alsace, France