The Collaborative International Dictionary of English v.0.48:

fuselage \fu"se*lage\ n. [F. fusel spindle-shaped + -age; fr. L.
   fusus spindle.] (A["e]ronautics)
   The central, approximately cylindrical portion of an airplane
   which carries the passengers, crew, and cargo. It usually
   forms the main structural portion of an airplane, and to it
   are typically attached the wings, tail, and sometimes the
   engines. In single-propeller airplanes, the propeller is
   typically fixed at the front of the fuselage, although
   variants have been produced with the propeller at the rear.
   Some airplanes have no fuselage, properly so called.

   Syn: body.
        [PJC] Fuse plug

The Collaborative International Dictionary of English v.0.48:

Nacelle \Na*celle"\ (n[.a]*s[e^]l"), n. [F.]
   1. A small boat. [Obs.]
      [Webster 1913 Suppl.]

   2. The basket suspended from a balloon; hence, the framework
      forming the body of a dirigible balloon, and containing
      the machinery, passengers, etc.
      [Webster 1913 Suppl.]

   3. A streamlined enclosure on an airplane, as for the engine
      or for the cargo or passengers; -- formerly used to refer
      to the boatlike, inclosed body of an airplane which is
      usually now called the fuselage, and now referring
      mostly to the enclosure for the engine.
      [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

fuselage
    n 1: the central body of an airplane that is designed to
         accommodate the crew and passengers (or cargo)