Something I learned here - the English word window comes from an old Germanic word vendauga meaning "wind eye". German started using something like fenster vend

Something I learned here - the English word window comes from an old Germanic word vendauga meaning "wind eye". German started using something like fenster vendauga (I don't know the actual phrase) to mean "a window with glass in it", from the Latin word fenestra. It later dropped the vendauga bit entirely. English has now borrowed the word fenster from German, to mean the erosion of a new bit of rock exposing an older bit.