Definition of four-leaf clover
- It's good luck to find a four-leaf clover.
: any of a genus (Trifolium) of low leguminous herbs having trifoliolate leaves and flowers in dense heads and including many that are valuable for forage and attractive to bees
: any of various related plants (as of the genera Melilotus, Lespedeza, or Medicago) of the legume family
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