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Definition of pilot balloon - 2 dictionary results

pilot balloon

–noun
a balloon for the visual observation of upper-atmosphere wind currents.

Origin:
1840–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pilot balloon  
n.  A small balloon used to determine wind velocity.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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