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ONAD→radiosonde

radiosonde

Flag: gbEnglishOxford New American Dictionary
radiosonde /ˈrādēōˌsänd, ˈreɪdioʊˌsɑnd /
▸ noun an instrument carried by balloon or other means to various levels of the atmosphere and transmitting measurements by radio.
– ORIGIN 1930s : from radio- (relating to broadcasting) + German Sonde ‘probe’.