Window is one of those words that is so very basic and common that we don't really even think about it. We tend to assume that it involves glass, though of course windows weren't always made of glass; earlier they were often simply holes in the wall,
designed to let in light and air, and, let smoke and odor out. In fact, windows are so very much taken for granted now, that we have forgotten that the word is a fossilized metaphor. Our modern English word window was borrowed in the middle ages from Old Norse. The Old Norse word for window is vindauga. Vindauga is a compound of vindr, "air, wind" and auga, "eye," or "wind eye," which, if you think about it, very much describes the function of a window. "Wind eye" is especially interesting as a metaphor because it's an example of a medieval Germanic poetic figure called a kenning.
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