cherry plum

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A deciduous ornamental Eurasian shrub or small tree (Prunus cerasifera) in the rose family, having white flowers and small red to yellow edible fruits.
• noun The fruit of this shrub or tree.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Prunus cerasifera, a deciduous ornamental Eurasian shrub or small tree, having white flowers and small red to yellow edible fruits.
• noun The fruit of such a tree.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun small Asiatic tree bearing edible red or yellow fruit