extraterrestrial.
Originating from outside of the Earth's atmosphere, from space, or from another planet; alien to Earth or its environment.
Meaning & usage
Originating from outside of the Earth's atmosphere, from space, or from another planet; alien to Earth or its environment.
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 terrestrial English extraterrestrial From extra- + terrestrial.
A being originating from outside of the Earth's atmosphere, from space, or from another planet; an alien.
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 terrestrial English extraterrestrial From extra- + terrestrial.
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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.