
An oriel window is a form of bay window which projects 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 mashrab...
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http://en.wikipedia.org/wiki/Oriel_window

A projecting curved or polygonal window.
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http://great-castles.com/glossary.php

projecting window in wall
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http://www.encyclo.co.uk/local/22129

A bay window that projects from the building above ground level. In medieval architecture, a bay window is corbeled out from the wall of an upper story.
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http://www.encyclo.co.uk/local/22196

A projecting bay window supported by brackets or a triangual support piece.
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http://www.encyclo.co.uk/local/22198

In architecture, an oriel window is a window projecting from the outer face of a wall, in plan semi- hexagonal, semi-octagonal, or rectangular, thus having three or more sides, divided by mullions and transoms into different bays and other projections, and supported by brackets or corbels. A projecting window rising from the ground is sometimes cal...
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projecting window in wall
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https://www.encyclo.co.uk/local/20402
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