un-wreón
This might be just a supplemental entry adding to an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
un-wreón
AddÞeáh wé wáce sýn and þás þing leóhtlíce unwreón, hig magon fremian bet þonne þá þe beóð on leóðwísan fægre geglenged, Angl. viii. 304, 2. Wé nú magon behýdan and behelian úra dǽda, ac hié bióð þonne opena and unwrigena, Verc. Först. 101, 7.
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

Abbreviation not recognized. See:

A Combined List of Abbreviations.