What term describes the fixed or movable framework of a window that contains the glass?

The term that describes the fixed or movable framework of a window that contains the glass is known as the sash. The sash is designed to hold the window glazing in place, which can be either a single pane or multiple panes of glass. It is crucial to the functionality of a window as it enables the opening and closing mechanism, allowing for ventilation and access to light while maintaining the integrity of the glass installation.

In contrast, the sill refers to the bottom part of the window frame that helps direct water away from the wall, while the frame is the entire structure that supports the sash and holds everything together. The jamb refers to the vertical sides of the window frame, which provide support for the sash as it opens and closes. Each of these components plays a role in window structure, but the sash specifically pertains to the part that directly holds the glass.