[pingk-root, -roo
t] 
| 1. | the root of any of various plants belonging to the genus Spigelia, of the logania family, esp. that of S. marilandica of the U.S., that is used as a vermifuge. |
| 2. | any of these plants. |
| pink·root (pĭngk'rōōt', -rŏŏt') n. A perennial plant (Spigelia marilandica) native to the southeast United States having flowers with a tubular corolla that is red outside and yellow inside. The rhizomes and roots were once used as a vermifuge. Also called wormgrass. |