- the root of any of various plants belonging to the genus Spigelia, of the logania family, especially that of S. marilandica of the U.S., that is used as a vermifuge.
- any of these plants.
- a disease of onions and other plants, characterized by pink, withered roots, caused by a fungus, Pyrenochaeta terrestris.
- any of several loganiaceous plants of the genus Spigelia, esp S. marilandica, of the southeastern US, having red-and-yellow flowers and pink roots
- the powdered root of this plant, used as a vermifuge
- a fungal disease of onions and related plants resulting in stunted growth and shrivelled pink roots
