/ Dictionary / Index S spinor: Meaning and Definition of Find definitions for: spin•or Pronunciation: (spin'ur), [key] — n. Math., Physics. a quantity resembling a vector or tensor that is used in physics to represent the spins of fermions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Spinone Italiano spinose Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language