资料来源 : Webster's Revised Unabridged Dictionary (1913)

   {Insect powder},a powder used for the extermination of
      insects; esp., the powdered flowers of certain species of
      {Pyrethrum}, a genus now merged in {Chrysanthemum}. Called
      also {Persian powder}.

资料来源 : WordNet®

insect powder
     n : a chemical used to kill insects [syn: {insecticide}]