posigrade rocket: Meaning and Definition of

pos'i•grade rock"et

Pronunciation: (poz'i-grād"), [key]
— Rocketry. Rocketry.
  1. an auxiliary rocket used to separate the sections of a multistage rocket, fired in the direction of flight.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.