1. an extremely poisonous white crystalline alkaloid, C21H22O2N2, derived from nux vomica and related plants, used as a poison for rodents and other pests and topically in medicine as a stimulant for the central nervous system.

1. A very toxic, colourless crystalline alkaloid, derived from nux vomica, used as a pesticide

1. A very poisonous alkaloid resembling brucine, obtained from various species of plants, especially from species of Loganiaceæ, as from the seeds of the st. Ignatius bean (Strychnos Ignatia) and from nux vomica. it is obtained as a white crystalline substance, having a very bitter acrid taste, and is employed in medicine (chiefly in the form of the sulphate) as a powerful neurotic stimulant. called also strychnia, and formerly strychnina.

1. A vegetable alkaloid (C21H22N2O2), the sole active principle of Strychnos Tieuté, the most active of the java poisons, and one of the active principles of S. Ignatii, S. Nux-vomica, S. colubrina, etc.

1. an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant