- a blackish, resinlike substance derived from tropical plants of the genus Strychnos, especially S. toxifera, and from the root of pareira, used by certain South American Indians for poisoning arrows and employed in physiological experiments, medicine, etc., for arresting the action of motor nerves.
- a plant yielding this substance.
- black resin obtained from certain tropical South American trees, esp Chondrodendron tomentosum, acting on the motor nerves to cause muscular paralysis: used medicinally as a muscle relaxant and by South American Indians as an arrow poison
- any of various trees of the genera Chondrodendron (family Menispermaceae) and Strychnos (family Loganiaceae) from which this resin is obtained
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