beach plum

n.
A seacoast shrub (Prunus maritima) in the rose family, native to northeast North America and having white flowers and edible, plumlike fruits used in jams, jellies, and pies.

A wild, dark purple plum found growing in sandy soil along the Atlantic coast. Its flavor is reminiscent of a grape-plum cross but because it's quite tart and bitter, the beach plum is not good for out-of-hand eating. It makes superior jams and jellies, however, as well as a delicious condiment for meats. See also plum.

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The noun has 2 meanings:

Meaning #1: seacoast shrub of northeastern North America having showy white blossoms and edible purple fruit
  Synonyms: beach plum bush, Prunus maritima

Meaning #2: small dark purple fruit used especially in jams and pies

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Lancome Beach Plum