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extragalactic

adjective

  1. concerning astrological objects that are outside the Milky Way galaxy
L336646 on Wikidata ↗

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.

  1. Originating outside of the Milky Way galaxy.

    Extragalactic astronomy is the study of things outside the Milky Way.

  2. Originating outside of any galaxy.
  3. Originating outside of the local galaxy.