Intrafenestration

Intrafenestration: noun. The space between the two frames of a window. Practically speaking this is the area where the glass panes of the window are most often located, but that is not always the case, which is why the word exists. For example there could be wooden beams in the intrafenestration separating the glass panes, or the glass could be missing entirely. Since such horrendous scenarios are a possibility the word has to exist.