• WordNet 3.6
    • n motherwort bitter Old World herb of hedgerows and woodland margins having toothed leaves and white or pale pink flowers
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Webster's Revised Unabridged Dictionary
    • n Motherwort (Bot) A labiate herb (Leonurus Cardiaca), of a bitter taste, used popularly in medicine; lion's tail.
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Century Dictionary and Cyclopedia
    • n motherwort A labiate plant, Leonurus Cardiaca, which grows in waste places. It has sometimes been used in amenorrhea.
    • n motherwort The mugwort, Artemisia vulgaris, formerly used for uterine affections.
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In literature:

Motherwort tea is very quieting to the nerves.
"The American Frugal Housewife" by Lydia M. Child
Motherwort is usually given in warm infusion, in suppression of the menses from cold.
"The People's Common Sense Medical Adviser in Plain English" by R. V. Pierce