Definition of pyrethrum noun from the Oxford Advanced Learner's Dictionary

     

    pyrethrum

     noun
    noun
    BrE BrE//paɪˈriːθrəm//
     
    ; NAmE NAmE//paɪˈriːθrəm//
     
     
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  1. 1 [countable] a type of flower grown especially in Kenya
  2. 2[uncountable] a substance made from this flower and used for killing insects