Nacelle

The nacelle (pronounced [nəˈsɛl]) is a cover housing (separate from the fuselage) that holds engines, fuel, or equipment on an aircraft or wind turbine. In some cases—most notably the World War II-era P-38 Lightning airplane—an aircraft's cockpit may also be housed in a nacelle. The covering is typically aerodynamically shaped.

In a jet engine the nacelle is composed of the podded engine inlet, fan cowl, thrust reverser, and the exhaust nozzle.

Other uses

In a wind turbine, the nacelle refers to the structure that houses all of the generating components, gearbox, drive train, etc.
In the Star Trek series it is used to describe the parts of a starship containing the warp drive propulsion systems.

Translation

The word "Nacelle" occurs as such in the following languages: English, Dutch, Norwegian (Bokmål).

Translation in French: Nacelle (avion).