Part of speech: noun

A clover.

Part of speech: noun

Arch. A three- lobed ornament.

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Usage examples "trefoil":

  1. They lay down in the dry grass, upon the gold bits of bird's- foot trefoil of the cliff's edge, and looked out to sea. - "The Trespasser", D.H. Lawrence.
  2. She then marches up the line to the captain, who pins on her trefoil badge, and explains that it is her Scout's " life." - "How Girls Can Help Their Country", Juliette Low Agnes Baden-Powell Robert Baden-Powell.
  3. The door is double with a triple shaft in the middle; the two openings have very flat trefoil heads with a small ogee curve to the central leaf. - "Portuguese Architecture", Walter Crum Watson.