apogalacteum
noun
ap·o·ga·lac·te·um
ˌapəgəˈlaktēəm,
-kshēəm;
-ˌgaˌlakˈtē-
plural -s
: the point of the hypothetical orbit of the sun or another star at which it is most remote from the galactic nucleus
Word History
Etymology
New Latin, from apo- + -galacteum (from Greek galakt-, gala milk)