Geology. a large mass of rock thrust a considerable distance along a nearly horizontal fault plane or in an overturned anticlinal fold.
Geometry. one of the two equal sections of a cone.

1905–10, Americanism; < French: literally, tablecloth, cloth; Old French nappe, nape < Latin mappa; cf. napkin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nappe (næp)
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
[C20: from French: tablecloth]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
If the upper nappe profile remains the same as it was while fully ventilated,
  the weir has sufficient ventilation.
Free flow occurs when a thin-plate weir allows free access of air under the
  falling jet sheet or nappe.
Consequently, the nappe does not contract from the width of the channel.
The height of pullup behind the nappe depends upon the drop, discharge, and
  crest length.
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