/ Dictionary / Index S supinator: Meaning and Definition of Find definitions for: su•pi•na•tor Pronunciation: (s'pu-nā"tur), [key] — n. Anat. a muscle used in supination. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: supinator (Thesaurus) supination supine Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language