extragalactic
adjective
- concerning astrological objects that are outside the Milky Way galaxy
Wiktionary
adj
Etymology: Etymology tree Proto-Indo-European *h₁éǵʰ Proto-Indo-European *-s Proto-Indo-European *h₁éǵʰs Proto-Indo-European *-teros Proto-Indo-European *h₁eǵʰsteros Proto-Italic *eksteros Latin exter Latin extrā English extra- English galactic English extragalactic From extra- + galactic.
- Originating outside of the Milky Way galaxy.
“Extragalactic astronomy is the study of things outside the Milky Way.”
- Originating outside of any galaxy.
- Originating outside of the local galaxy.