Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "Mæð-hild." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 664.
. If this be a woman's name, it could not be that which later becomes Matilda, cf. Mathild, Chr. 1067; P. 202, 28: Mahtild, 1083; P. 215, 22. O.H.Ger. Maht-hilt.