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pilot balloon

noun
1.
a balloon for the visual observation of upper-atmosphere wind currents.
Origin of pilot balloon
1840-1850
1840-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for pilot balloon
Historical Examples
  • The pilot balloon, that is so soon out of sight, can offer no guidance—don't forget that!

    Luttrell Of Arran Charles James Lever
British Dictionary definitions for pilot balloon

pilot balloon

noun
1.
a meteorological balloon used to observe air currents
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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7
9
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