Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "lǽdend." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 6.
, es; m. One who excuses :-- Ne hyld ðú míne heortan ðæt ic lǽdend wese láðra firena ut non declines cor meum ad excusandas excusationes in peccatis, Ps. Th. 140, 5. Cf. ládian.