(ˈwɪtʃˌwiːd) n (Plants) any of several scrophulariaceous plants of the genus Striga, esp S. hermonthica, that are serious pests of grain crops in parts of Africa and Asia
witch•weed
(ˈwɪtʃˌwid)
n. any plant of the genus Striga, of the figwort family, parasitic on grasses and grass crops. [1900–05]