sonde noun. [sɒnd] E20.
[French = sounding-line, sounding.]
1. A radiosonde or similar device that is sent aloft to transmit or record information on conditions in the atmosphere. Orig. only in comb. with specifying word, as ballon-sonde etc. E20.

2. An instrument probe for transmitting information about its surroundings underground or under water. M20.

[TahlilGaran] English Dictionary ▲