Definition of "aerostat" []

• An aircraft, especially a balloon or dirigible, deriving its lift from the buoyancy of surrounding air rather than from aerodynamic motion. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "AFP/Getty Images Then: The aerostat is illuminated in green during the Commonwealth Games opening ceremony at the Jawaharlal Nehru stadium in New Delhi, October 3, 2010."
• "AFP/Getty Images The aerostat is illuminated in green depicting a tree at opening ceremony."
• "The centerpiece will be the 40-meter-wide-by-12-meter-high "aerostat," a balloon on which high-resolution video screens will display images meant to complement performances."