Noah Webster's Dictionary (n.) 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.

Multi-Version Concordance Blackberry (2 Occurrences) Luke 6:44 For every tree is judged by its fruit. Men do not get figs from thorns, or grapes from blackberry plants. (BBE) Isaiah 55:13 In place of the thorn will come up the fir-tree, and in place of the blackberry the myrtle: and it will be to the Lord for a name, for an eternal sign which will not be cut off. (BBE)