- a balloon for the visual observation of upper-atmosphere wind currents.
Origin of pilot balloon
First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for pilot balloon
His white cravat was tied before in a sort of pilot-balloon, or white rosicrucian puff.
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