fearn
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.
fearn
Add: Fearn (feran, Erf.) filix, Txts. 62, 420. Filix, fearn cujus radix utilis est ad soluendam difficultatem pariendi, Wrt. Voc. ii. 39, 35. Filicumque and fearnes oðða fearna, 37, 48. Wiþ þeóhece, smíce mid fearne swíþe þá þeóh, Lch. ii. 64, 26. [The word forms the first part of many local names, v. C. D. vi. pp. 286, 287.]
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.

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A Combined List of Abbreviations.