Word: gasbag
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...Nonrigid airships (balloons) are constructed with no metal framework in the gasbag save a ring at the bottom to which fabric, valves and passenger basket are attached. The semirigid dirigible ("blimp") employs a keel or spine of structural metal usually aluminum, to stiffen the under side of the envelope, support cabins, motors, crew. The rigid (Zeppelin) type of ship has a complete skeleton of struts and girders, with hoops articulated laterally inside its spine and ribs to form separate gas chambers when covered with fabric inside as well...