rockoon

[rok-oon, ro-koon]

noun

a rocket launched from a balloon at a high altitude.

Origin of rockoon

1950–55; rock(et¹) + (ball)oon

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rockoon

Historical Examples of rockoon

I also understand that a rockoon is a combination of a rocket and a balloon.
The Flying Stingaree
Harold Leland Goodwin

British Dictionary definitions for rockoon

rockoon

noun

a rocket carrying scientific equipment for studying the upper atmosphere, fired from a balloon at high altitude

Word Origin for rockoon

C20: from rocket 1 + balloon

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012