Meaning of beach plum

beach' plum"

Pronunciation: [key]
  1. a shrub, Prunus maritima, of the rose family, of the seashores of northeastern North America, having sharply toothed leaves and white flowers.
  2. the purple or blackish edible fruit of this shrub.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.