fenster

[fen-ster]
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noun Geology.

an erosional break in an overthrust rock sheet, exposing the rocks that underlie the sheet.

Origin of fenster

1920–25; < German: literally, window; Old High German fënster < Latin fenestra
Also called window.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of fenster