Prunus maritima pru·nus·ma·ritima uncommon noun 1. seacoast shrub of northeastern North America having showy white blossoms and edible purple fruit Synonymsbeach plumbeach plum bushPrunus maritima Related words Broader terms wild plum Part of beach plum WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.