/ Dictionary / Index S sargassum: Meaning and Definition of Find definitions for: sar•gas•sum Pronunciation: (sär-gas'um), [key] — n. any seaweed of the genus Sargassum, widely distributed in the warmer waters of the globe, as S. bacciferum, the common gulfweed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sargassum (Thesaurus) Sargasso Sea sargassumfish Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language