means An opening in a wall or vehicle, usually filled with glass, that lets in light and a view while keeping out the weather.

from From Old Norse 'vindauga,' literally 'wind-eye' — 'vindr' (wind) plus 'auga' (eye) — picturing the opening as an eye in the wall through which the wind could peer or pass. Norse settlers carried the word into English, where it nudged aside the older Old English 'eagþyrl' (eye-hole) and 'fenester' (a borrowing from Latin 'fenestra,' still alive in French 'fenêtre' and German 'Fenster').