1) Herb 2) Herbaceous plant 3) Leonurus cardiaca 
• (n.) A labiate herb (Leonurus Cardiaca), of a bitter taste, used popularly in medicine; lion`s tail. • (n.) The mugwort. See Mugwort.
Moth'er·wort` noun (Botany) (a) A labiate herb ( Leonurus Cardiaca ), of a bitter taste, used popularly in medicine; lion's tail. (b) The mugwort. See Mugwort . 
Motherwort (Leonurus cardiaca) is a herbaceous plant belonging to the family Labiate. It rarely occurs wild in Britain but is common in continental Europe and North America. It has whorls of pale reddish flowers, and its lower leaves are three-lobed. It was formerly used as an expectorant in medicine.
[n] - bitter Old World herb of hedgerows and woodland margins having toothed leaves and white or pale pink flowers
Leonurus cardiaca noun bitter Old World herb of hedgerows and woodland margins having toothed leaves and white or pale pink flowers
a European plant, Leonorus cardiaca, of the mint family, an introduced weed in the U.S., having cut leaves with a whorl of lavender flowers in the axils.