galactic equatorEnglishOxford New American Dictionarygalactic equator /ɡəˈlaktik əˈkwādər, , ɡəˈlæktɪk əˈkweɪdər, ēˈkwādər, iˈkweɪdər/ ▸ noun Astronomy the great circle passing as closely as possible through the densest parts of the Milky Way.