pilot balloon

1. 1.

   meteorological balloon used to observe air currents

   Broadermeteorological balloon

Questions about pilot balloon

What does pilot balloon mean?

pilot balloon means "meteorological balloon used to observe air currents".

Is pilot balloon a common word?

pilot balloon is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.