Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun extraterrestrial

1 sense of extraterrestrial

Sense 1
extraterrestrial being, extraterrestrial, alien -- (a form of life assumed to exist outside the Earth or its atmosphere)
       => hypothetical creature -- (a creature that has not been observed but is hypothesized to exist)

Similarity of adj extraterrestrial

1 sense of extraterrestrial

Sense 1
extraterrestrial -- (originating or located or occurring outside Earth or its atmosphere; "is there extraterrestrial life?")