a balloon for the visual observation of upper-atmosphere wind currents.
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- pilot bird,
- pilot biscuit,
- pilot boat,
- pilot burner,
- pilot cell
Origin of pilot balloon
First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for pilot balloon
Still another device employed by meteorologists is the pilot-balloon.The Mentor: The Weather|Charles Fitzhugh Talman
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