/ Dictionary / Index S synecious: Meaning and Definition of Find definitions for: syn•e•cious Pronunciation: (si-nē'shus), [key] — adj. synoicous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. synechism synecology Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language