nappe

A sheet of water flowing over a dam or similar structure.

A large sheetlike body of rock that has been moved far from its original position.

Either of the two parts into which a cone is divided by the vertex.

A surface swelling out from a point in the form of a cone or hyperboloid about its vertex.

In geometry, a sheet; a separate portion of a surface.

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.

The profile of a body of water flowing over an obstruction in a vertical drop.

Either of the two parts of a double cone.

A sheet–like mass of rock that has been folded over adjacent strata.

Nappe, the underside of which is not in contact with the overflow structure and is at ambient atmospheric pressure.