/ Dictionary / Index S synkaryon: Meaning and Definition of Find definitions for: syn•kar•y•on Pronunciation: (sin-kar'ē-on", -un), [key] — pl. n. -kar•y•a a nucleus formed by the fusion of two preexisting nuclei. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. synizesis synnema Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language