a balloon for the visual observation of upper-atmosphere wind currents.
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How to use pilot balloon in a sentence
Still another device employed by meteorologists is the pilot-balloon.The Mentor: The Weather | Charles Fitzhugh Talman
His white cravat was tied before in a sort of pilot-balloon, or white rosicrucian puff.
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
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