noun an annual south american and west indian plant (spigelia anthelmia).
2. pinkroot ·noun the root of spigelia marilandica, used as a powerful vermifuge; also, that of s. anthelmia. ·see definition 2 (below).
3. pinkroot ·noun a perennial north american herb (spigelia marilandica), sometimes cultivated for its showy red blossoms. called also carolina pink, maryland pinkroot, and worm grass.