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

     

    trefoil

     noun
    noun
    BrE BrE//ˈtrefɔɪl//
     
    ; NAmE NAmE//ˈtrefɔɪl//
     
    ; BrE BrE//ˈtriːfɔɪl//
     
    ; NAmE NAmE//ˈtriːfɔɪl//
     
     
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  1. 1 (specialist) a plant whose leaves are divided into three similar parts, for example clover
  2. 2a decoration or a design shaped like a trefoil leaf
  3. Word Origin Middle English: from Anglo-Norman French trifoil, from Latin trifolium, from tri- ‘three’ + folium ‘leaf’.
See the Oxford Advanced American Dictionary entry: trefoil