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

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Astronautics) a rocket carrying scientific equipment for studying the upper atmosphere, fired from a balloon at high altitude
[C20: from rocket1 + balloon]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
In July, they ran a test from Unst of a system known as rockoon, which deploys large air balloons to launch rockets from the edge of the Earth's atmosphere.
Solar Ship has partnered with Loonify Space to develop a rockoon (rocket + balloon) launch platform that offers flexible, affordable and reliable launch services tailored to micro-satellite operators, the company said.
This he describes as a 'Rockoon' or a mix of both, a rocket as well as a hot-air balloon, according to AP.