fe·ver·few 
(fēvər-fy′)
(fēvər-fy′)n.
An aromatic plant (Tanacetum parthenium syn. Chrysanthemum parthenium) native to Eurasia, having clusters of buttonlike, white-rayed flower heads and used as an herbal medicine primarily to treat migraine headaches.
[Middle English feverfu, from Old English feferfuge and from Anglo-Norman *fevrefue, both from Late Latin febrifugia : febris, fever + fuga, flight.]