Pel·li·to·ry, n.  Bot. (a) A composite plant (Anacyclus Pyrethrum) of the Mediterranean region, having finely divided leaves and whitish flowers. The root is the officinal pellitory, and is used as an irritant and sialogogue. Called also bertram, and pellitory of Spain. (b) The feverfew (Chrysanthemum Parthenium); -- so called because it resembles the above.
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  Fe·ver·few n.  Bot. A perennial plant (Pyrethrum Parthenium, or Chrysanthemum Parthenium) allied to camomile, having finely divided leaves and white blossoms; -- so named from its supposed febrifugal qualities.
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  Chrysanthemum parthenium
       n : bushy aromatic European perennial herb having clusters of
           buttonlike white-rayed flower heads; valued traditionally
           for medicinal uses; sometimes placed in genus
           Chrysanthemum [syn: feverfew, Tanacetum parthenium]