an airborne instrument used to send meteorological information back to earth by radio
Also called: radiometeorograph
Word origin
C20: radio- + French sonde sounding line
radiosonde in American English
(ˈreɪdioʊˌsɑnd)
US
noun
a compact package of meteorological instruments and a radio transmitter, usually carried aloft by a small balloon to measure and transmit to ground observers temperature, pressure, and humidity data from the upper atmosphere
Word origin
Fr < radio (see radio) + sonde, a sounding line < sonder, to sound3