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Trefoil

n.
  1. (Bot.) Any plant of the genus Trifolium, which includes the white clover, red clover, etc.; -- less properly, applied also to the nonesuch, or black medic. See Clover, and Medic.
  2. (Arch.) An ornamental foliation consisting of three divisions, or foils.
  3. (Her.) A charge representing the clover leaf.