ge-ærnan
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
ge-ærnan
Add: to reach a place by riding Wé settað ǽghwelcere cirican . . . þis frið. Gif hié fáh mon geierne oþþe geærne (reach it on foot or on horseback ), Ll. Th. i. 64, 9.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.