eorþ-fæst
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.
eorþ-fæst
AddSume men synd swá áblende hí bringað heora lác tó eorðfæstum stáne, Hml. S. 17, 130. Hig lǽddon þone cyning tó ánum eorðfæstum treówe and tígdon hine þǽr tó, 32, 109. [v. N. E. D. earthfast. Icel. jarð-fastr.]
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.