- a colorless, crystalline poison, C21H22N2O2, obtained chiefly by extraction from the seeds of nux vomica, formerly used as a central nervous system stimulant.
- an Indian tree, Strychnos nux-vomica, of the logania family, having small, yellowish-white flowers in clusters, berrylike fruit, and seeds that yield strychnine.
- a white crystalline very poisonous alkaloid, obtained from the plant nux vomica: formerly used in small quantities as a stimulant of the central nervous system and the appetite. Formula: C 21 H 22 O 2 N 2
