radio-sonde

radiosonde

[rey-dee-oh-sond]
noun Meteorology.
an instrument that is carried aloft by a balloon to send back information on atmospheric temperature, pressure, and humidity by means of a small radio transmitter.
Compare rawinsonde.


Origin:
1935–40; radio- + sonde

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World English Dictionary
radiosonde (ˈreɪdɪəʊˌsɒnd)
 
n
Also called: radiometeorograph an airborne instrument used to send meteorological information back to earth by radio
 
[C20: radio- + French sonde sounding line]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
radiosonde   (rā'dē-ō-sŏnd')  Pronunciation Key 
An instrument that is carried into the atmosphere by a balloon, makes measurements of temperature, air pressure, humidity, and wind speed and direction, and transmits the measurements back to the ground. A radiosonde is typically sent to altitudes of approximately 30 km (18.6 mi). There are approximately 70 radiosonde stations across the continental United States. Each station launches two radiosondes daily.
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