| Aerostat 1. (n.) A balloon, dirigible, or any lighter-than-air aircraft. Thesaurus Entries Graf Zeppelin, aerostat, ballonet, balloon, basket, blimp, car, catwalk, dirigible, dirigible balloon, envelope, gas chamber, gasbag, gondola, lighter-than-air craft, mooring harness, rigid airship, sandbag, semirigid airship, ship, subcloud car, zeppelin | ![]() |