apogalacteum

noun
ap·​o·​ga·​lac·​te·​um | \ˌapəgəˈlaktēəm, -kshēəm;-ˌgaˌlakˈtē-\
plural -s

Definition of apogalacteum 

: the point of the hypothetical orbit of the sun or another star at which it is most remote from the galactic nucleus

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History and Etymology for apogalacteum

New Latin, from apo- + -galacteum (from Greek galakt-, gala milk)

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