/ Dictionary / Index G gelsemium: Meaning and Definition of Find definitions for: gel•se•mi•um Pronunciation: ( jel-sē'mē-um), [key] — pl. -mi•ums, -mi•a the dried rhizome and roots of yellow jasmine, formerly used as a sedative in the form of a powder, tincture, or fluid extract. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gelsemium (Thesaurus) gel mineral Gelsenkirchen Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language