strych·nine 
(str
ĭk
n
īn
′, -n
ĭn, -n
ēn
′)
n. An extremely poisonous white crystalline alkaloid, C21H22O2N2, derived from nux vomica and related plants, used as a poison for rodents and other pests and formerly as a stimulant.
[French, from New Latin Strychnos, genus name, from Latin strychnon, a kind of nightshade, from Greek strukhnon.]