Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

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