what is a mullioned window
Mullioned windows are windows which are divided into adjacent panes with the use of mullions, which are vertical elements used to break up a space. Mullions are especially associated with Gothic design, and some very fine examples of mullioned doors and windows can be seen in Gothic cathedrals and homes.arger mullioned windows may be used to illustrate a brief story or allegory, especially in church architecture. In this sense, the windows are more decorative than functional, since the stained glass obscures the flow of light into the building.