Definition of French window

French window, despite its name, is a heavily fenestrated double door, usually found in domestic buildings and opening on to a garden.

 

Definition of dormer window

Dormer is a window which protrudes vertically from the plane of a pitched roof. Dormer windows can be included as part of the original design of a building, but are frequently added to existing buildings to create more light and usable space.

Example of dormer windows

Definition of Y-tracery

Y-tracery is a simple tracery form in which a central mullion splits into two branches, forming a Y-shape.

George Street House | Mississippi, US