noun Meteorology.
an instrument similar to a radiosonde that is attached to a parachute and released from an aircraft.

1945–50; drop + (radio)sonde

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World English Dictionary
dropsonde (ˈdrɒpsɒnd)
meteorol a radiosonde dropped by parachute
[C20: drop + (radio)sonde]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To use targeting of dropsonde observations to improve numerical forecasts.
Aircraft radar and dropsonde data are available and are organized by storm and year.
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