noun, plural gelsemiums, gelsemia [jel-see-mee-uh] .
the dried rhizome and root of yellow jasmine, formerly used as a sedative in the form of a powder, tincture, or fluid extract.

1870–75; < Neo-Latin < Italian gelsom(ino) jasmine + Latin -ium -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gelsemium (dʒɛlˈsiːmɪəm)
n , pl -miums, -mia
1.  any climbing shrub of the loganiaceous genus Gelsemium, of SE Asia and North America, esp the yellow jasmine, having fragrant yellow flowers
2.  the powdered root of the yellow jasmine, formerly used as a sedative
[C19: New Latin, from Italian gelsominojasmine]

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