Noun
yellow olive-sized semitropical fruit with a large free stone and relatively little flesh; used for jellies
evergreen tree of warm regions having fuzzy yellow olive-sized fruit with a large free stone; native to China and Japan
small tree of China and Japan bearing large yellow to red plums usually somewhat inferior to European plums in flavor
Source: WordNetPromises that you make to yourself are often like the Japanese plum tree - they bear no fruit. Francis Marion
From this diversity only two species, the hexaploid European plum (Prunus domestica) and the diploid Japanese plum (Prunus salicina and hybrids), are of worldwide commercial significance. Source: Internet