aerostat(redirected from Envelope (lighter-than-air-craft))
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An aircraft, especially a balloon or dirigible, deriving its lift from the buoyancy of surrounding air rather than from aerodynamic motion.
[French aérostat : Greek āero-, aero-; see aero- + Greek statos, standing; see stato-.]
aer′o·stat′ic, aer′o·stat′i·cal adj.
(Aeronautics) a lighter-than-air craft, such as a balloon
[C18: from French aérostat, from aero- + Greek -statos standing]
ˌaeroˈstatic, ˌaeroˈstatical adj
any lighter-than-air aircraft, as a balloon or dirigible.