Definition of witchweed
: any of a genus (Striga) of yellow-flowered Old World plants of the snapdragon family that are damaging root parasites of grasses (as sorghum and maize) and that include one (S. asiatica) which is an introduced pest in parts of the southeastern United States
First Known Use of witchweed
Learn More about witchweed
Britannica.com: Encyclopedia article about witchweed
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