Definition of rattlesnake master
: a perennial herb (Eryngium yuccifolium) of the carrot family native to the eastern half of the U.S. that has a basal rosette of bluish-green, fibrous, parallel-veined, swordlike leaves that may reach a length of 30 inches (76 centimeters) and small, greenish-white flowers clustered in dense flower heads resembling thistle : button snakeroot sense 2
Note: The sap of rattlesnake master was once thought to prevent snake bites.
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