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Definition of trefoil noun from the Oxford Advanced American Dictionary

     

    trefoil

     noun
    noun
    NAmE//ˈtrifɔɪl//
     
     
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  1. 1(technology) a plant whose leaves are divided into three similar parts, for example clover
  2. 2a decoration or a design shaped like a trefoil leaf
See trefoil in the Oxford Advanced Learner's Dictionary
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