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