My question is a simple one. What is the name for the type of old fashioned fixed window made up of smaller panes of glass?

Originally I had used "glass-paned window", but what narrator would ever feel the need to specify that a window was made of glass? It felt silly. But, I would like to name the window just to create the atmosphere of this particular setting.

The setting is an old fashioned "manor" type building in the midst of a grungy/futuristic city. I would use the word "window" by itself for any other setting in the city, but inside this building it feels too modern.

Any ideas? What would you call it?