bloodrootPronunciation: /ˈblʌdruːt/Definition of bloodroot noun 1a North American plant of the poppy family, which has white flowers and fleshy underground rhizomes which exude red sap when cut. Sanguinaria canadensis, family Papaveraceae 2a lily-like Australian plant with a red rhizome which is roasted and eaten by some Aborigines. Haemodorum coccineum, family Haemodoraceae bloodroot in other Oxford dictionaries Definition of bloodroot in the US English dictionary