Meaning of radiosonde

ra•di•o•sonde

Pronunciation: (rā'dē-ō-sond"), [key]
— n. Meteorol.
  1. 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. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.