- the seed of the orangelike fruit of an East Indian tree, Strychnos nux-vomica, of the logania family, containing strychnine, used in medicine.
- the tree itself; strychnine.
- an Indian spiny loganiaceous tree, Strychnos nux-vomica, with orange-red berries containing poisonous seeds
- any of the seeds of this tree, which contain strychnine and other poisonous alkaloids
- a medicine manufactured from the seeds of this tree, formerly used as a heart stimulant
