Bow window

A bow window or compass window is a curved bay window. Like bay windows, bow windows add space to a room by projecting beyond the exterior wall of a building and provide a wider view of the garden or street outside than flush windows, but combine four or more facets, differentiating them from the more common three-sided bay window. Casement windows are often used for ventilation.

Bow windows first appeared in the eighteenth century in the United Kingdom (and in the Federal period in the United States).