Illustrated Architecture Dictionary
A curved window that sticks out from the wall of a house
Bow windows are designed to create space by projecting beyond the exterior wall of a building, and to provide a wider view of the garden or street outside, and typically combine four or more casement windows.
Bow windows form a gentle outward curve.
Bow windows may be found on any level of a building.
Bow-front house: bow extends from top to bottom of the house. The bow-front fashion dates to the Federal period.
See also: Bay window
Examples from Buffalo architecture: