HyperDic: pilot_balloon

English > 1 sense of the expression pilot balloon:
NOUNartifactpilot balloonmeteorological balloon used to observe / observe air currents
English > pilot balloon: 1 sense > noun 1, artifact
Meaningmeteorological balloon used to observe / observe air currents.
Broadermeteorological balloonA small unmanned balloon set aloft to observe atmospheric conditions

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