/ Dictionary / Index E extra-atmospheric: Meaning and Definition of Find definitions for: ex•tra-at•mos•pher•ic Pronunciation: (ek"stru-at"mus-fer'ik, -fēr'-), [key] — adj. outside the earth's atmosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. extra extra-base hit 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