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2017 Word of the Year

posigrade rocket

[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.
Origin of posigrade rocket
1960-1965
1960-65; posi(tive) + -grade (perhaps modeled on retrograde)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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