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rockoon

American  
[rok-oon, ro-koon] / ˈrɒk un, rɒˈkun /

noun

  1. a rocket launched from a balloon at a high altitude.

rockoon British  
/ rɒˈkuːn /

noun

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

"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

Etymology

Origin of rockoon

1950–55; rock(et 1 ) + (ball)oon

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.