Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun In geometry, a sheet; a separate portion of a surface.
  • noun A surface swelling out from a point in the form of a cone or hyperboloid about its vertex.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) Sheet; surface; all that portion of a surface that is continuous in such a way that it is possible to pass from any one point of the portion to any other point of the portion without leaving the surface. Thus, some hyperboloids have one nappe, and some have two.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The profile of a body of water flowing over an obstruction in a vertical drop.
  • noun mathematics Either of the two parts of a double cone.
  • noun geology A sheet-like mass of rock that has been folded over adjacent strata.
  • noun hydraulics Nappe, the underside of which is not in contact with the overflow structure and is at ambient atmospheric pressure.
  • noun cooking The ability of a liquid to "coat the back of a spoon" or the act of coating a food.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French, tablecloth, nappe, from Old French, tablecloth, from Latin mappa, napkin; see map.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French nappe.

Examples

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