bay window

an alcove of a room, projecting from an outside wall and having its own windows, especially one having its own foundations. Compare bow window, oriel.
Informal. a large, protruding belly; paunch.

1400–50; late Middle English Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bay window
bow window See also oriel window Sometimes shortened to: bay a window projecting from the wall of a building and forming an alcove of a room

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica

bay window

window formed as the exterior expression of a bay within a structure, a bay in this context being an interior recess made by the outward projection of a wall. The purpose of a bay window is to admit more light than would a window flush with the wall line

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The cupola resembles a circular bay window and will provide a vastly improved
  view of the station's exterior.
Almost every room had been created equal, with its own fireplace, bay window
  and style of molding.
Kitchen has lots of natural wood cabinets and a bay window.
The bay window reflected the glare of the western sun.
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