/ Dictionary / Index S superspeed: Meaning and Definition of Find definitions for: su•per•speed Pronunciation: (s'pur-spēd"), [key] — adj. constructed or intended to function at a very high speed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. supersonic transport superstar Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language