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Definition of Spanish fly noun from the Oxford Advanced American Dictionary

     

    Spanish fly

     noun
    noun
     
    (pl. Spanish flies)
     
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  1. 1[countable] a bright green insect that has a strong smell and produces a harmful substance
  2. 2[uncountable] a poisonous mixture made from the crushed bodies of these insects, that is said to give people a strong desire to have sex
See the Oxford Advanced Learner's Dictionary entry: Spanish fly