nappe

noun \ ˈnap \

Definition of nappe

1 : sheet 6
2 : a large mass of rock thrust over other rocks
3 : one of the two sheets that lie on opposite sides of the vertex and together make up a cone

Origin and Etymology of nappe

French, tablecloth, sheet, nappe, from Old French nape — more at napkin


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allowing a liquid or gas to pass through

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