Noun
The root of Spigelia Marilandica, used as a powerful vermifuge; also, that of S. Anthelmia. See definition 2 (below).
A perennial North American herb (Spigelia Marilandica), sometimes cultivated for its showy red blossoms. Called also Carolina pink, Maryland pinkroot, and worm grass.
An annual South American and West Indian plant (Spigelia Anthelmia).
Source: Webster's dictionary