Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "un-fægerness." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 1103.
.Add :-- Þ̵ hálige wîf ne ondréd hire náht þǽre útran scame and unfægernesse sancta mulier nihil exterioris deformitatis (cf. valde ignea conspersio corporis inerat) timuit, Gr. D. 379, 15.