Part of speech: noun

A bag inflated with a light gas so that it rises and floats in the air.

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Usage examples "balloon":

  1. C. According to the testimony given at the Court of Inquiry held afterwards, two hours after they abandoned the balloon and started struggling through the snow, B. became tired and complained of his fatigue. - "The Glands Regulating Personality", Louis Berman, M.D..
  2. You see, there was a weather balloon released here. - "The Flying Saucers are Real", Donald Keyhoe.
  3. That would put them up in the air higher than a balloon. - "Private Peat", Harold R. Peat.