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posigrade rocket

American  
[poz-i-greyd] / ˈpɒz ɪˌgreɪd /

noun

Rocketry.

  1. an auxiliary rocket used to separate the sections of a multistage rocket, fired in the direction of flight.

Etymology

Origin of posigrade rocket

1960–65; posi(tive) + -grade (perhaps modeled on retrograde )

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.