A bow window or compass window is a curved bay window. 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 windows, which join to form an arch, differentiating them from the more common and often three-sided bay window. Casement windows are often used.
- Sturgis, Russell. "Bow window, Compass window" Sturgis' illustrated dictionary of architecture and building: an unabridged reprint of the 1901-2 edition. Mineola, N.Y.: Dover, 1989. Print.
- "Bow window" at The Illustrated Architecture Dictionary