Moth·er·wort n. Bot. (a) A labiate herb (Leonurus Cardiaca), of a bitter taste, used popularly in medicine; lion's tail. (b) The mugwort. See Mugwort.
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Li·on's tail n. Bot. A genus of labiate plants (Leonurus); -- so called from a fancied resemblance of its flower spikes to the tuft of a lion's tail. Leonurus Cardiaca is the common motherwort.
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Leonurus cardiaca
n : bitter Old World herb of hedgerows and woodland margins
having toothed leaves and white or pale pink flowers
[syn: motherwort]