Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "ymb-ryne." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 753.
, es; m.I.course of a moving body :-- Wǽron sume gedwolmen ðe cwǽdon, ðæt ǽlc man beó ácenned be steorrena gesetnyssum, and þurh heora ymbryna him wyrd gelimpe, Homl. Th. i. 110, 8. II.course of time, revolution, period :-- Ðes geárlíca ymryne ús gebrincþ efne nú ða clǽnan tíd Lenctenlíces fæstenes, Homl. Th. ii. 98, 24. Gyf hé (the 29th of February) byð forlǽten unteald, ðǽrrihte áwent eall ðæs geáres ymbryn[e] (-rene, v. l. ) þwyres, Lchdm. iii. 264, 12. Emrynes lustrationis, circuli, curriculo annorum, Hpt. Gl.