/ Dictionary / Index S synarthrosis: Meaning and Definition of Find definitions for: syn•ar•thro•sis Pronunciation: (sin"är-thrō'sis), [key] — pl. -ses immovable articulation; a fixed or immovable joint; suture. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. synarthrodia synastry Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language