This might be just a supplemental entry adding to an entry in the Main Volume.
níd-hǽmestre
.Add (?): an adulteress (?). Perhaps níd-hǽmestre glosses stuprorum amatrix rather than amatrix. See preceding word, where the passage glossed is given.
Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "níd-hǽmestre." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 65.