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In airplanes, the nacelle is a covered housing separated from the main structure that usually holds engines, fuel, or equipment. The covering is shaped in a curved manner, in order to maximize aerodynamics.
In balloons, nacelles are suspended baskets containing machinery and passengers.
In the Star Trek fictional universe, the term is used for the long, tubular portions of a starship that house the warp engines.
The word in all of its uses is derived from the Old French "nacele", which means 'small boat' or 'dinghy'.
Nacelle is an American motorcycling magazine.