extragalactic.
Originating outside of the Milky Way galaxy.
Meaning & usage
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.
Where this word comes from
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.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.