/ Dictionary / Index D dorsum: Meaning and Definition of Find definitions for: dor•sum Pronunciation: (dôr'sum), [key] — pl. -sa the back, as of the body. the back or outer surface of an organ, part, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dorsum (Thesaurus) dorsoventral Dort Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language