sonde

[sond]
noun Rocketry.
a rocket, balloon, or rockoon used as a probe for observing phenomena in the atmosphere.

Origin:
1920–25; < French: plumb line; see sound3

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World English Dictionary
sonde (sɒnd)
 
n
a rocket, balloon, or probe used for observing in the upper atmosphere
 
[C20: from French: plummet, plumb line; see sound³]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Outside air was directed over the sonde by this ducting.
The sonde was deployed at the construction site on an offshore buoy.
The horizontal coverage of an individual sonde varies depending upon the track the sonde takes as it ascends.
If a sonde fails, please try to replace it immediately.
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