/ Dictionary / Index S somnific: Meaning and Definition of Find definitions for: som•nif•ic Pronunciation: (som-nif'ik, sum-), [key] — adj. causing sleep; soporific; somniferous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: somnific (Thesaurus) somniferous somnolent Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language