Fuselage is used specifically in aviation and aerospace contexts. The engineers performed safety checks on the aircraft's fuselage.
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Not Always Cylindrical
Fuselages may vary in shape, not just the common cylindrical form, depending on the aircraft design. The stealth bomber's fuselage has a flattened, broad shape.
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Sectional Use
Fuselage can also refer to a part of the aircraft body, like the nose or tail section. Damage was reported on the rear fuselage after a rough landing.