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dropsonde

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

First recorded in 1945–50; drop + (radio)sonde
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for dropsonde

dropsonde

noun
  1. meteorol a radiosonde dropped by parachute
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Word Origin

C20: drop + (radio) sonde
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012