/ Dictionary / Index S superstring theory: Meaning and Definition of Find definitions for: su'per•string theo"ry Pronunciation: (s'pur-string"), [key] any supersymmetric string theory in which each type of elementary particle is treated as a vibration of a single fundamental stringat a particular frequency. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. superstring superstructure 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