GELSEMIUM Meaning of GELSEMIUM in English [ dʒɛl'si:mɪəm ]■ noun a preparation of the rhizome of yellow jasmine, used in homeopathy to treat flu-like symptoms.OriginC19: mod. L., from Ital. gelsomino 'jasmine'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004