pilot balloon
noun
a balloon for the visual observation of upper-atmosphere wind currents.
Origin of pilot balloon
First recorded in 1840–50
Words nearby pilot balloon
pilonidal sinus,
pilos,
pilose,
pilosebaceous,
pilot,
pilot balloon,
pilot bird,
pilot biscuit,
pilot boat,
pilot burner,
pilot cell
Example sentences from the Web for pilot balloon
Still another device employed by meteorologists is the pilot-balloon.
The Mentor: The Weather |Charles Fitzhugh Talman
British Dictionary definitions for pilot balloon
pilot balloon
noun
a meteorological balloon used to observe air currents