pilot balloon
pi·lot·bal·loon
noun
1.
meteorological balloon used to observe air currents
Related words
Broader terms
WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
pi·lot·bal·loon
meteorological balloon used to observe air currents
WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.