any of several auxiliary air containers within a balloon or airship, that can be inflated or deflated to compensate for changing gas pressure during flight: used to control altitude and maintain proper structure
Origin of ballonetFrench ballonnet, diminutive of ballon, balloon
One of several small auxiliary gasbags placed inside a balloon or a nonrigid airship that can be inflated or deflated during flight to control and maintain shape and buoyancy.
Origin of ballonetFrench ballonnet diminutive of ballon balloon ; see balloon .
From French ballonnet.