(?) :-- On prodbore in foro, Mt. Kmbl. Rush. 11, 16. On protbore, 20, 3. [Cf.(?) bor and prod a pointed instrument; to prod to prick, Jamieson, and common in many parts of England, as if foro were connected with forare.]
Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "prod-bor." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 778.