/ Dictionary / Index S synarthrodia: Meaning and Definition of Find definitions for: syn•ar•thro•di•a Pronunciation: (sin"är-thrō'dē-u), [key] — pl. -di•ae synarthrosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. synaptic cleft synarthrosis 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