Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A device used for high-altitude sounding, composed of a small, solid-propellant rocket that is launched from a balloon.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rocket, powered by solid fuel, that is not lit while on the ground but first carried into the upper atmosphere by a gas-filled balloon, then separated from the balloon and automatically ignited to allow it to achieve a higher altitude.

Etymologies

rock(et)1 + (ball)oon.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Blend of rocket and balloon (Wiktionary)

Examples

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  • A rocket fired from a balloon, or a balloon carrying a rocket.

    July 9, 2008