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free balloon

noun
1.
a balloon, often equipped to carry passengers, that drifts with air currents and whose ascent and descent are controlled by the release of ballast and buoyant gas.
Related forms
free ballooning, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for free balloon
  • Also used to denote the determination of upper winds by the tracking of a free balloon.

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