WordReference Random House Unabridged Dictionary of American English © 2025
pi′lot balloon′, 
  1. Meteorologya balloon for the visual observation of upper-atmosphere wind currents.
  • 1840–50

Collins Concise English Dictionary © HarperCollins Publishers::
pilot balloon
  1. a meteorological balloon used to observe air currents
'pilot balloon' also found in these entries (note: many are not synonyms or translations):
pibal

Forum discussions with the word(s) "pilot balloon" in the title:


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