Jisho

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Noun
1. rockoon; rocket-launched balloonfrom rocket + balloon
Wikipedia definition
2. RockoonA rockoon is a solid fuel sounding rocket that, rather than being immediately lit while on the ground, is first carried into the upper atmosphere by a gas-filled balloon, then separated from the balloon and automatically ignited. This allows the rocket to achieve a higher altitude, as the rocket does not have to move under power through the lower and thicker layers of the atmosphere. The original concept was developed by Cmdr. Lee Lewis, Cmdr. G. Halvorson, S. F. Singer, and James A.
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Read “ロックーン” on Japanese Wikipedia
Read “Rockoon” on DBpedia

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