/ Dictionary / Index S syncytium: Meaning and Definition of Find definitions for: syn•cy•tium Pronunciation: (sin-sish'um, -ē-um), [key] — pl. -cy•tia a multinucleate mass of cytoplasm that is not separated into cells. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: syncytium (Thesaurus) syncrisis synd. Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language