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galactocentric

adjective
ga·​lac·​to·​cen·​tric | \gə¦laktə¦sen‧trik\

Definition of galactocentric 

: having or relating to the Milky Way as the center a galactocentric universe

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First Known Use of galactocentric

1884, in the meaning defined above

History and Etymology for galactocentric

galact- + -centric

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The first known use of galactocentric was in 1884

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