The term 'enclosed part of a blimp' can be summarized as the NACELLE, which is a seven-letter word. A NACELLE is an aerodynamic structure that houses the engine and other components of an aircraft or airship. It is typically located on the wing or fuselage of an aircraft, or at the top of a blimp. The NACELLE provides protection for the engine and other components from the elements, as well as providing a streamlined shape to reduce drag.