/ Dictionary / Index E extraterrestrial: Meaning and Definition of Find definitions for: ex•tra•ter•res•tri•al Pronunciation: (ek"stru-tu-res'trē-ul), [key] — adj. outside, or originating outside, the limits of the earth. —n. an extraterrestrial being: a science fiction novel about extraterrestrials conquering the earth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: extraterrestrial (Thesaurus) extrasystole extraterritorial Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language