"rockoon." YourDictionary, n.d. Web. 19 October 2018. <http://www.yourdictionary.com/rockoon>.
rockoon. (n.d.). Retrieved October 19th, 2018, from http://www.yourdictionary.com/rockoon
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.