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Related to sonde: sonder
Any of various instruments, such as a radiosonde, used for measuring or testing physical conditions.
[French sonde, sounding line, probe, Old French, sounding line, from Old English sund(rāp), sounding (line), from sund, sea.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) a rocket, balloon, or probe used for observing in the upper atmosphere
[C20: from French: plummet, plumb line; see sound3]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a rocket or balloon used as a probe for observation of atmospheric phenomena.
[1920–25; < French: plumb line; see sound3]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.