motherwort Syllabification: (moth·er·wort)Pronunciation: /ˈməT͟Hərˌwərt, -ˌwôrt/Definition of motherwort noun a tall strong-smelling plant of the mint family, with purplish-pink lipped flowers clustering close to the axils. It is used in herbal medicine, especially in the treatment of gynecological disorders. Leonurus cardiaca, family Labiatae motherwort in other Oxford dictionaries Definition of motherwort in the British & World English dictionary