'Blackberry' definitions:

Definition of 'blackberry'

(from WordNet)
noun
Large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus
noun
Bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle [syn: blackberry, blackberry bush]
verb
Pick or gather blackberries; "The children went blackberrying"

Definition of 'Blackberry'

From: GCIDE
  • 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; Rubus villosus and Rubus Canadensis are the high blackberry and low blackberry of the United States. There are also other kinds. [1913 Webster]