juneberryDefinition of juneberry noun (plural juneberries) a North American shrub of the rose family, some kinds of which are grown for their showy white flowers and bright autumn colours. Genus Amelanchier, family Rosaceae: many species, including A. laevis, which has naturalized in England the edible berry of the juneberry plant. juneberry in other Oxford dictionaries Definition of juneberry in the US English dictionary