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

1920–25; < French: plumb line; see sound3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sonde (sɒnd)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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.
Image for sonde
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