• IPA: /ˈtɹɛ.fɔɪl/, /ˈtɹiː.fɔɪl/

trefoil (plural trefoils)

  1. Any of several plants of the pea family, having compound, trifoliate leaves; especially one of the genus Trifolium.
  2. A symbol having the shape of such leaves, especially when used as an architectural ornament.
  3. (topology) Ellipsis of trefoil knot#English|trefoil knot.
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