feónd-rǽs
This might be just a supplemental entry substituting part of an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
feónd-rǽs
Substitute: A hostile attack, an onslaught, assault Ic fracoðlíce feóndrǽs gefremede . . . and reáfode beám on bearwe I (Eve) wickedly made onslaught and despoiled the tree in the garden, Gen. 900. [Frolle him to fusden mid his feondræse (reasde mid his feondreases, 2nd MS.), Laym. 23960.]
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.