Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "næs-gristle." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 646.
the gristle or cartilage of the nose :-- Naesgristlae cartilago, Ep. Gl. 7 b, 5. Naesgristle, Wrt. Voc. ii. 102, 45. Næsgristle, 13, 10. [Þe laðe helle wurmes þe freoteð ham ut te ehnen ant to nease gristles, O. E, Homl. i. 251, 16.] v. nos-gristle.