Pyrethrin

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Pyrethrin \Pyr"eth*rin\, n. [NL. Pyrethrum, generic name of
     feverfew, Gr. ? feverfew.] (Chem.)
     A substance resembling, and isomeric with, ordinary camphor,
     and extracted from the essential oil of feverfew; -- called
     also {Pyrethrum camphor}.
     [1913 Webster]