1. A flexible bag designed to be inflated with hot air or with a
gas, such as helium, that is lighter than the surrounding air,
causing it to rise and float in the atmosphere.
Such a bag with ... sufficient capacity to lift and transport a
suspended gondola or other load.
Such a bag shaped like a figure or object when inflated; an inflatable.
[Source: The American Heritage? Dictionary of the English
Language, Fourth Edition Copyright ? 2000 by Houghton Mifflin