Definition of feverfew
: a perennial European composite (see 1composite 1b) herb (Tanacetum parthenium synonym Chrysanthemum parthenium) that has small white daisylike flowers with yellow centers, is sometimes cultivated as an ornamental, has become naturalized through much of North America, and has been used in herbal medicine to treat a variety of conditions (such as fever, migraine headaches, and menstrual cramps)
