lucky clover

noun5

1. •
   A four-leaf clover, believed to bring good luck
2. •
   Any four-leaf variant of the normally three-leaf species of clover of genus Trifolium
3. •
   Any of certain normally four-leaf plants similar to clover.
4. •
   Oxalis tetraphylla (four-leaf sorrel)
5. •
   Marsilea quadrifolia (European water-clover)