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fenster

noun
fen·​ster | \ ˈfenztə(r), -n(t)st-\
plural -s

Definition of fenster

: an erosional opening down through overthrust rock exposing the underlying rock

— called also window

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History and Etymology for fenster

German, literally, window, from Old High German; akin to Old English fenester window, Middle Low German & Middle Dutch venster, venstere; all from a prehistoric West Germanic word borrowed from Latin fenestra

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