/ Dictionary / Index I interstellar: Meaning and Definition of Find definitions for: in•ter•stel•lar Pronunciation: (in"tur-stel'ur), [key] — adj. situated or occurring between the stars: interstellar dust. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: interstellar (Thesaurus) Interstate Highway System interstice 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