Word Study
soundboard |
soundbox |
sounded |
sounder |
sounding |
sounding balloon
| sounding board
| sounding lead
| sounding line
| sounding out
| sounding rocket
sounding balloon
CIDE DICTIONARY
sounding balloon,
An unmanned balloon sent aloft for meteorological or aëronautic purposes. [Webster 1913 Suppl.]
For further exploring for "sounding balloon" in Webster Dictionary Online