/ Dictionary / Index S stum: Meaning and Definition of Find definitions for: stum Pronunciation: (stum), [key] — n., v., stummed, stum•ming. —n. unfermented or partly fermented grape juice. wine in which increased fermentation has taken place because of the addition of stum. —v.t. to increase the fermentation of (wine) by adding stum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. stultify stumble Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language