/ Dictionary / Index D diarthrosis: Meaning and Definition of Find definitions for: di•ar•thro•sis Pronunciation: (dī"är-thrō'sis), [key] — pl. -ses a form of articulation that permits maximal motion, as the knee joint. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diarthrosis (Thesaurus) diarrhea diary Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language