Definition of radio balloon
: a small unmanned sounding balloon carrying diminutive radio sets for transmitting meteorological recordings to ground observers or for measuring cosmic rays in the stratosphere
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up radio balloon? Please tell us where you read or heard it (including the quote, if possible).