/ Dictionary / Index D dorsiflexor: Meaning and Definition of Find definitions for: dor•si•flex•or Pronunciation: (dôr'su-flek"sur), [key] — n. Anat. a muscle causing dorsiflexion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dorsiflexion dorsispinal Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language