In architecture, a rosace (also called a rose window) is a large circular decorative window or ornament, most commonly found in Gothic churches and cathedrals. It usually contains intricate stone tracery and stained glass arranged in a radial pattern resembling a flower.

Key features:

Circular shape with symmetrical patterns
Often filled with stained glass
Common in Gothic architecture
Serves both decorative and lighting purposes

Famous examples include the rose windows of Notre-Dame de Paris and Chartres Cathedral.

If you encountered the term “ROSACE architecture” in engineering, software, or aerospace, tell me the context—it can refer to something completely different from the architectural rosace.