One of the mysteries of the English language finally explained.
A sesquiterpene lactone, C₁₅H₂₀O₃, with antibacterial and cytotoxic properties which is the active ingredient in preparations of the leaves and flowers of feverfew, Tanacetum parthenium, used as a herbal medicine for the prevention of migraine.
1950s. From scientific Latin parthen- + -o- + l- + -ide.
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