Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "mǽd-land." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 626.
, es; m. Meadow-land, grass-land which is mown :-- Ǽgðer ge mǽdlondes ge eyrþlondes both of land for mowing and of arable land, Cod. Dipl. Kmbl. ii. 95, 16. Médlandes, vi. 219, 4. v. mǽdwe-land.