Noun | 1. | ![]() blackberry - large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus blackberry bush, blackberry - bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle boysenberry, boysenberry bush - cultivated hybrid bramble of California having large dark wine-red fruit with a flavor resembling raspberries loganberry, Rubus loganobaccus, Rubus ursinus loganobaccus - red-fruited bramble native from Oregon to Baja California |