Black·ber·ry n.  The fruit of several species of bramble (Rubus); also, the plant itself. Rubus fruticosus is the blackberry of England; Rubus villosus and Rubus Canadensis are the high blackberry and low blackberry of the United States. There are also other kinds.
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  Rubus fruticosus
       n : the true blackberry of Europe as well as any of numerous
           varieties having sweet edible black or dark purple
           berries [syn: true blackberry]