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Noun: trefoil  'tree,foyl or 'tre,foyl
  1. Any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves
    - medic, medick
     
  2. A plant of the genus Trifolium
    - clover
     
  3. An architectural ornament in the form of three arcs arranged in a circle

Derived forms: trefoils

Type of: architectural ornament, herb, herbaceous plant

Part of: genus Medicago, genus Trifolium, Medicago, Trifolium

Encyclopedia: Trefoil, Alberta