/ Dictionary / Index S superluminal: Meaning and Definition of Find definitions for: su•per•lu•mi•nal Pronunciation: (s"pur-l'mu-nl), [key] — adj. Astron. appearing to travel faster than the speed of light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. superliner superlunary Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language