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Definition of posigrade - 1 dictionary result
pos·i·grade   (pŏz'ĭ-grād')   
adj.  Of, relating to, or being an auxiliary rocket on a multistage spacecraft that is fired in the direction of the spacecraft's motion to separate the sections.

[posi(tive) + (retro)grade.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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