This might be just a supplemental entry adding to an entry in the Main Volume.
manigteáw-ness
.Add :-- Ðæt sunnan gér byð gesett on þrím hund dagum and fíf and syxtigum dagum and syx tídum þæs þe ásmeáde séo msenigtýwnes geþungenra wera, Angl. viii. 298, 5.
Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "manigteáw-ness." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 631.