the plane of the galactic equator.
the plane passing through the spiral arms of the Galaxy
noun, Astronomy. 1. either of the two opposite points on the celestial sphere that are farthest north and south of the Milky Way.
noun, Astronomy. 1. the duration of a complete rotation of the Milky Way, approximately 200 million years.
[guh-lak-tin] /gəˈlæk tɪn/ noun, Biochemistry. 1. .
1. a combining form meaning “milk,” used in the formation of compound words: galactopoietic. combining form 1. milk or milky: galactometer galacto- or galact- pref. Milk: galactotherapy.