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Adjective: extraterrestrial  ,ek-stru-tu'res-tree-ul
  1. Originating or located or occurring outside Earth or its atmosphere
    "is there extraterrestrial life?"
Noun: extraterrestrial  ,ek-stru-tu'res-tree-ul
  1. A form of life assumed to exist outside the Earth or its atmosphere
    - extraterrestrial being, alien, ET

Derived forms: extraterrestrials

Type of: hypothetical creature

Encyclopedia: Extraterrestrial