1. any of certain composite plants of the genus Prenanthes, whose roots or tubers have been regarded as a remedy for snake bites, as P. serpentaria or P. alba.
2. the root or tuber.
3. the snakeroot, Polygala senega.
4. its root.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.