Source : Webster's Revised Unabridged Dictionary (1913)

Blackberry \Black"ber*ry\ (bl[a^]k"b[e^]r*r[y^]), n. [OE.
   blakberye, AS. bl[ae]cberie; bl[ae]c black + berie berry.]
   The fruit of several species of bramble ({Rubus}); also, the
   plant itself. {Rubus fruticosus} is the blackberry of
   England; {R. villosus} and {R. Canadensis} are the high
   blackberry and low blackberry of the United States. There are
   also other kinds.

Source : WordNet®

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}]