Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "a-cunnian." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 6.
.Add: (1) to put to the proof, try, test :-- Se ongebróhta teóna ácunnað (probat), húlic gehwilc man byþ, Gr. D. 47, 9. Ácunna mé proba me, Ps. Spl. C. 25, 2. Ácunnian experiri, Wrt. Voc. ii. 32, 68. Ácunnod (beón), 145, 50. Wæs ácunnad temtabatur, Mk. L. 1, 13. Bið ácunned nititur, Rtl. 59, 27. Folc byþ ácunnod (experiretur), Gr. D. 204, 13. Áfandod and ácunnod experimentum habens, 262, 5. Ácunnod on geleáfan, Hml. S. 31, 134. Gif úre crístendóm ne bið ácunnod, 4, 248.