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nappe  audio  (np) KEY 

NOUN:
  1. A sheet of water flowing over a dam or similar structure.
  2. Geology A large sheetlike body of rock that has been moved far from its original position.
  3. Mathematics Either of the two parts into which a cone is divided by the vertex.

ETYMOLOGY:
French, tablecloth, nappe, from Old French, tablecloth, from Latin mappa, napkin ; see map


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