Anacyclus pyrethrum

from WordNet (r) 3.0 (2006)

Anacyclus pyrethrum
    n 1: a small Mediterranean plant containing a volatile oil once
         used to relieve toothache [syn: {pellitory}, {pellitory-of-
         Spain}, {Anacyclus pyrethrum}]

from The Collaborative International Dictionary of English v.0.48

Pellitory \Pel"li*to*ry\, n. [Sp. pelitre, fr. L. pyrethrum. See
   {Bertram}.] (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.
       [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Pyrethrine \Pyr"eth*rine\, n. (Chem.)
   An alkaloid extracted from the root of the pellitory of Spain
   ({Anacyclus pyrethrum}).
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Bertram \Ber"tram\, n. [Corrupted fr. L. pyrethrum, Gr. ? a hot
   spicy plant, fr. ? fire.] (Bot.)
   Pellitory of Spain ({Anacyclus pyrethrum}).
   [1913 Webster]