ærn
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.
ærn
Add: [older ræn. v. ærn-þegen] Gif ealo áwerd sié, genim elehtran, lege on ðá feówer sceátas ðæs ærnes and ofer ðá duru and under ðone þerxwold and under ðæt ealofæt, Lch. ii. 142, 11. Healde hine mon on óðrum ærne (húse, v. l. ), Ll. Th. i. 64, 15: Bl. H. 221, 16. Seó reáde netele ðe þurh ærne in wyxð, Lch. iii. 52, 12. Genim grun*-*deswyligean ðá ðe on ærenu wexeð, 48, 29. v. bæþ-, beód-, geréf-, hálig-, mete-, mót-, sealt-, sprǽc-, stál-, wæsc-, wíte-ærn; tigel-ærne: earn in Dict.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.