posi·​grade | \ ˈpäzəˌgrād \

Definition of posigrade

: relating to, using, or being an auxiliary rocket that imparts additional thrust to a spacecraft in the direction of motion

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First Known Use of posigrade

1961, in the meaning defined above

History and Etymology for posigrade

positive + -grade (as in retrograde)

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The first known use of posigrade was in 1961

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Cite this Entry

“Posigrade.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/posigrade. Accessed 15 Aug. 2020.

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