Rattlesnake root Meaning, Definition & Usage

  1. noun herb of central and southern Europe having purple florets
    Prenanthes purpurea.
  2. noun a plant of the genus Nabalus

WordNet

Definitions
  1. (Bot.), a name given to certain American species of the composite genus Prenanthes (P. alba and P. serpentaria), formerly asserted to cure the bite of the rattlesnake. Calling also lion's foot, gall of the earth, and white lettuce.

Webster 1913