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Definition of posigrade rocket - 1 dictionary result

pos⋅i⋅grade rock⋅et

[poz-i-greyd]
–noun Rocketry.
an auxiliary rocket used to separate the sections of a multistage rocket, fired in the direction of flight.

Origin:
1960–65; posi(tive) + -grade (perh. modeled on retrograde)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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