madwort

noun
mad·​wort | \ ˈmad-ˌwərt How to pronounce madwort (audio) , -ˌwȯrt\

Definition of madwort

2 : a low hairy annual European herb (Asperugo procumbens) of the borage family with blue flowers and a root used as a substitute for madder

First Known Use of madwort

1597, in the meaning defined at sense 1

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