One of the mysteries of the English language finally explained.
A compound isolated from the plant Parthenium hysterophorus, originally thought to be an alkaloid and used in the treatment of neuralgia and fevers, and later identified as a sesquiterpene lactone (C₁₅H₁₈O₄) which is responsible for the allergic contact dermatitis associated with the plant.
Late 19th century; earliest use found in Therapeutic Gazette. From scientific Latin Parthenium, genus name + -in, after Spanish partenina.
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