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nappe

[nap] /næp/
noun
1.
Geology. a large mass of rock thrust a considerable distance along a nearly horizontal fault plane or in an overturned anticlinal fold.
2.
Geometry. one of the two equal sections of a cone.
Origin of nappe
1905-1910
1905-10, Americanism; < French: literally, tablecloth, cloth; Old French nappe, nape < Latin mappa; cf. napkin
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for nappe

nappe

/næp/
noun
1.
a large sheet or mass of rock, commonly a recumbent fold, that has been thrust from its original position by earth movements
2.
the sheet of water that flows over a dam or weir
3.
(geometry) either of the two parts into which a cone (sense 2) is divided by the vertex
Word Origin
C20: from French: tablecloth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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