Definition of "mugwort"

Mugwort is with good success put among other herbs that are boiled, for women to sit over the hot decoction to draw down their courses, to help the delivery of the birth and expel the afterbirth, as also for the obstructions and inflammations of the mother.

1653, Nicholas Culpeper, The English Physician Enlarged, Folio Society, published 2007, page 197

Peony would keep away any kind of storms. Mugwort hung over doorways on Midsummer's Day, June 24, would keep off lightning, as St. John's-Wort would if gathered before sunrise on that day.

1940, Rosetta E. Clarkson, Green Enchantments: The Magic Spell of Gardens, The Macmillan Company, page 258