drop sonde

dropsonde

[drop-sond]
noun Meteorology.
an instrument similar to a radiosonde that is attached to a parachute and released from an aircraft.

Origin:
1945–50; drop + (radio)sonde

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

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