gelsemium

noun
gel·​se·​mi·​um | \ jel-ˈsē-mē-əm How to pronounce gelsemium (audio) \

Medical Definition of gelsemium

1 capitalized : a small genus of woody vines (family Loganiaceae) of Asia and the southern United States that include the yellow jessamine (G. sempervirens)
2 plural gelsemiums or gelsemia\ -​mē-​ə How to pronounce gelsemia (audio)\ : the root of the yellow jessamine formerly used in medicine