| 1. | any of various plants of the genus Eryngium, esp. E. yuccifolium, having spiny leaves and dense, rounded flower heads. |
| 2. | any of several other plants, esp. of the genus Liatris. |
| rattlesnake master n. Any of several plants, such as Eryngium yuccifolium of the eastern United States, supposedly effective against the venom of rattlesnakes and having narrow leaves with spiny margins and whitish flower heads. Also called button snakeroot. |